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Mgsc 220 Final
Aircraft arrives at an airport with only one runway (Poisson process). An average of 6 aircrafts arrive at the airport eac ...
Mgsc 220 Final
Aircraft arrives at an airport with only one runway (Poisson process). An average of 6 aircrafts arrive at the airport each hour. What is the ...
Need help with this 2 tes
Question 1
A(n) ________ occurs when ________ independent variable(s) have an effect in combinati ...
Need help with this 2 tes
Question 1
A(n) ________ occurs when ________ independent variable(s) have an effect in combination with one another.
interaction; two or more
interaction; two or less
main effect; two or more
main effect; two or less
2.5 points
Question 2
Interested
in the effects of different kinds of instruction on videogame
performance, Martin asks 30 college freshmen to each play an hour of
Ratchet and Klank. Participants are randomly assigned to one of three
instruction groups: (1) complete the tasks as quickly as possible, (2)
conserve as much health as possible (i.e., play more carefully), or (3)
find gold bolts (worth lots of money in equipment and ammunition). If
Martin averages the scores for each instruction group and then compares
them, any differences in the means of the instruction groups reflect:
individual differences in hand-eye coordination.
inherent differences in the ability of the college freshmen to play video games.
within-groups variance.
between-groups variance.
2.5 points
Question 3
Why can't a researcher just run multiple t tests when the independent variable has more than two levels?
As you run more statistical tests, it becomes harder and harder to reject the null hypothesis.
As you run more statistical tests, the probability that you will make a Type I error in one of the tests increases.
As you run more statistical tests, you lose degrees of freedom.
As you run more statistical tests, the probability that you will make a Type III error in one of those tests increases.
2.5 points
Question 4
________ is a term used to describe an independent variable in a study with more than one independent variable.
Interaction
Main effect
Effect
Factor
2.5 points
Question 5
(Table:
Coping with Pain) The cells of this study reflect an interaction
between coping style and cognitive strategy. Which statement best
describes the interaction?
People
using both distraction and sensation-monitoring cognitive strategies
were able to keep their hand in the ice water for longer than 60
seconds, on average.
People using a sensation-monitoring strategy were able to keep their hand in the ice water for longer.
People using a distraction strategy were able to keep their hand in the ice water for longer.
The
effect of cognitive strategy depended on the coping style of the
participant. Those with an avoiding coping style kept their hand in the
ice water longer when using a distraction strategy, but those with a
monitoring coping style kept their hand in the ice water longer when
using a sensation-monitoring strategy.
2.5 points
Question 6
A five-way ANOVA has:
five dependent variables and two independent variables.
one dependent variable and five independent variables.
one dependent variable and four independent variables.
five dependent variables and five independent variables.
2.5 points
Question 7
The F ratio is calculated by:
dividing a measure of within-groups variability by a measure of between-groups variability.
averaging the results from the t tests for all possible two-group comparisons.
dividing a measure of between-groups variability by a measure of within-groups variability.
initially squaring all the scores.
2.5 points
Question 8
According to Cohen's conventions, an R2 of 0.19 is considered to be a(n) ________ effect size.
small
medium
large
erroneous
2.5 points
Question 9
Given
a scale dependent variable and a nominal independent variable with
three or more levels, we could use a(n) ________ to analyze the data.
PRE test
z test
t test
ANOVA
2.5 points
Question 10
A researcher wants to statistically test whether gender affects math test scores. Which test should the researcher use?
one-way ANOVA
two-way ANOVA
three-way ANOVA
within-groups ANOVA
2.5 points
Question 11
In a two-way ANOVA, the researcher makes decisions regarding ________ null hypotheses.
three separate
two separate
three interdependent
two interdependent
2.5 points
Question 12
A
researcher wants to examine people's preference for pets by having 10
people act as “foster owners” for four different types of family pets:
dogs, cats, birds, and fish. The participants will foster each type of
pet for one week, and a scale measure will be used to assess preference.
What research design should be used?
one-way between-groups ANOVA
correlation
one-way within-groups ANOVA
paired-samples t tests
2.5 points
Question 13
The F ratio is a ratio of:
two (or more) sample means.
two variances.
sample means divided by sample variances.
two sum-of-squares estimates.
2.5 points
Question 14
A post-hoc test is warranted when:
the F is significant and there are more than two groups.
we fail to reject the null hypothesis in an ANOVA.
we reject the null hypothesis when performing an independent-groups t test.
we have an a priori prediction about which group means will differ.
2.5 points
Question 15
A hypothesis test with two nominal independent variables and a scale dependent variable is a:
one-way ANOVA.
two-way ANOVA.
two-groups t test.
two-groups z test.
2.5 points
Question 16
A within-groups ANOVA is used when we have ________ independent variable(s) with ________ levels.
1; more than 2
2; more than 2
1; less than 2
2; less than 2
2.5 points
Question 17
Which degrees of freedom value is unique to the one-way within-groups ANOVA?
between-groups
subjects
within-groups
total
2.5 points
Question 18
The Bonferroni, Scheffé, and Tukey are all examples of:
hypothesis tests.
post-hoc tests.
effect size statistics.
confidence intervals.
2.5 points
Question 19
In Zinman and Zitzewitz's (2009) research on snowfall reports, they found the following interaction:
the amount of snowfall reported by resorts was always exaggerated, but that phenomenon was even greater on the weekends.
weekday snow reports were less interesting to skiers than weekend reports.
snowfall reports were more common during weekends than weekdays, but this was even more true when there was fresh snow.
snowfall
reports were exaggerated, and this was more pronounced for the weather
reports provided by radio stations compared to resorts.
2.5 points
Question 20
A
researcher is interested in whether circadian rhythms influence
participants' performance on different kinds of memory tests. The
researcher first classifies participants according to whether each is a
morning person or evening person. The researcher then randomly assigns
participants to receive either an implicit memory test or an explicit
memory test. The researcher next tests everyone at 8 A.M. How many cells
does this study have?
2
4
6
8
2.5 points
Question 21
The z, t, and F calculations have something in common: the numerator of the test statistic:
contains a measure of difference among groups.
contains a measure of sample variability.
is a squared number.
represents what would be expected to happen by chance.
2.5 points
Question 22
The assumptions for all ANOVAs are the same and include all of the following EXCEPT:
random selection of participants
population is normally distributed
population variances are equal
participants are all different across conditions
2.5 points
Question 23
________ is the proportion of variance in the dependent variable that is accounted for by the independent variable.
t
Cohen's d
R2
z
2.5 points
Question 24
According to Cohen's conventions, an effect size of 0.019 for a one-way within-groups ANOVA is considered to be:
small.
medium.
medium-to-large.
large.
2.5 points
Question 25
Forys
and Dahlquist (2007) investigated the effects of coping style and
cognitive strategy on dealing with pain. Participants were first
classified as having a monitoring or avoiding coping style. Participants
were then randomly assigned to one of two cognitive strategy
conditions, distraction or sensation monitoring. Participants were next
instructed to use the cognitive strategy while submerging their hand in
ice water. The researchers measured pain tolerance as the number of
seconds participants were able to keep their hand in the ice water. How
would you label the ANOVA used to analyze this data?
4 × 2 between-groups ANOVA
4 × 2 within-groups ANOVA
2 × 2 between-groups ANOVA
2 × 2 within-groups ANOVA
2.5 points
Question 26
Identify the correct formula for degrees of freedom between-groups:
Ngroups – 1
n – 1
Ntotal – 1
n – 2
2.5 points
Question 27
A
researcher is interested in whether circadian rhythms influence
participants' performance on different kinds of memory tests. The
researcher first classifies participants according to whether each is a
morning person or an evening person. The researcher then randomly
assigns participants to receive either an implicit memory test or an
explicit memory test. The researcher then tests everyone at 8 A.M. How
would you label the ANOVA used to analyze these data?
4 × 2 between-groups ANOVA
4 × 2 within-groups ANOVA
2 × 2 between-groups ANOVA
2 × 2 within-groups ANOVA
2.5 points
Question 28
A measure of the differences among group means is:
the z score.
between-groups variance.
within-groups variance.
the proportionate reduction in error.
2.5 points
Question 29
An interaction occurs when:
the dependent variable does not depend on any of the independent variables.
two independent variables both influence the dependent variable.
the effects of one independent variable depend on the level of the other independent variable.
a single independent variable changes the dependent variable, disregarding all other variables in the study.
2.5 points
Question 30
F is obtained by dividing ________ by ________.
SSbetween; dfbetween
MSbetween; MSwithin
dfbetween; SSbetween
SSbetween; SSwithin
2.5 points
Question 31
In
addition to assessing whether each independent variable has an effect
on the dependent variable, a factorial ANOVA also allows you to:
use multiple dependent measures in a single analysis.
control
for a third variable that might be related to the dependent measure,
prior to investigating the independent variable of interest.
determine whether the effects of one factor depend on the other factor.
partition out the variability due to individual differences and the variability due to measurement error.
2.5 points
Question 32
Heteroscedastic populations are those that:
have the same variance.
have homogeneity of means.
share common means.
have different variances.
2.5 points
Question 33
According to Cohen's conventions, an effect size of 0.29 for a one-way within-groups ANOVA is considered to be:
small.
medium.
medium-to-large.
large.
2.5 points
Question 34
An effect size of 0.015 for a two-way ANOVA is considered to be:
small.
medium.
large.
an error.
2.5 points
Question 35
If you calculate an F statistic and find that it is negative, then you know that:
the within-groups variance exceeds the between-groups variance.
the difference among the group means is greater than what would have occurred by chance.
you have made a calculation error.
the difference among the group means is less than what would have occurred by chance.
2.5 points
Question 36
A
boarding school (where students live and go to school) wants to find
out if students’ scores on a Happiness Rating Scale change over the
course of their first year. To this end, they administer the rating
scale to students during the first week, and again at the end of the
school year. Which type of t-test should the school staff use to test
whether there is a significant change in happiness ratings?
t-test for independent means
one-sample (single sample) t-test
t-test for dependent means
a combination of all 3.
2.5 points
Question 37
If
the results of a two-tailed t-test were to be presented in a research
article, and there were 25 participants, what is the appropriate number
in parentheses after the t?
t(25)
t(1)
t(2)
t(24)
2.5 points
Question 38
A
community psychologist observes that children in a certain school tend
to score lower on standardized math tests than students at other schools
in the district. He knows that the mean scores of children in the
district as a whole is 110. Which type of t-test should he use to
determine whether the scores of the children in the school differ
significantly from the scores in the school district overall?
t-test for independent means
one-sample (single sample) t-test
t-test for dependent means
none of the above
2.5 points
Question 39
A
psychologist publishes a paper based on a study and states that the
results are significant at the .05 level. Based on this information,
which of the following could be the p value of the results of the study?
.045
.4
.104
.06
2.5 points
Question 40
A
social psychologist wants to test whether introverts and extroverts
have different numbers of friends on a social networking site. She
administers a personality test and, based on the results, divides the
participants into 2 groups, Introverts and Extroverts. She then surveys
the groups to find out how many friends they have recorded on the social
networking site. Which type of t-test should she use to analyze the
results?
t-test for independent means
one-sample (single sample) t-test
t-test for dependent means
It doesn’t matter, any of them should work.
Miami Dade College Looking at Statistics Discussion
The internet is host to a wealth of information and much of that information comes from raw data that have been collected ...
Miami Dade College Looking at Statistics Discussion
The internet is host to a wealth of information and much of that information comes from raw data that have been collected or observed.Many websites summarize such data using graphical methods discussed in this chapter.Find a website related to your major that summarizes data and uses graphs, and share it with the class. Let us know how it relates to your major and why it is of interest to you.
Columbia Southern University Statistics Questionnaire
Problems need to include all required steps and answer(s) for full credit. All answers need to be reduced to lowest terms ...
Columbia Southern University Statistics Questionnaire
Problems need to include all required steps and answer(s) for full credit. All answers need to be reduced to lowest terms where possible. If showing the answer in %, have two decimal places.Answer the following problems showing your work and explaining or analyzing your results. Submit your work in a typed Microsoft Word document.A restaurant leaves a fishbowl on the counter for diners to drop their business cards. Once a month, a business card is pulled out to award one lucky diner with a free meal. Identify which type of sampling is used and why. (2 pts)A test of the effectiveness of a new curriculum could begin by dividing an area by school district, then choosing a school or set number of schools at random and sampling students from each. Identify which type of sampling is used and why. (2.5 pts)A survey about timekeeping might divide the population by time zone, then take 100 random samples per zone. Identify which type of sampling is used and why. (2.5 pts)A local TV station conducts an “Instant Poll” to predict the winner in the upcoming mayoral election. Evening news viewers were invited to phone in their votes, with the results to be announced on the late-night news. Based on the phone calls, the station predicted that Joseph Serra would win the election with 52% of the vote. They were wrong: Serra lost, getting only 46% of the vote. This faulty prediction may be the consequence of what kind of bias? (2.5 pts)According to Abyss Consulting, the average age of viewers of “America’s Got Talent” is 25 years old. However, the producer of the show thinks it is higher than 25.
Write the null hypothesis Ho and alternative hypothesis Ha. (2.5 pts)Is this a right-tailed, left-tailed, or two-tailed test? (2 pts)A research analyst believes that average back-to-school spending is less than a trade group’s prediction of $606.
Write the null hypothesis Ho and alternative hypothesis Ha. (2.5 pts)\Is this a right-tailed, left-tailed, or two-tailed test? (2 pts)\A study found that, in 2005, 12.5% of workers belonged to unions. Suppose a sample of 400 workers is collected in 2006 to determine whether union efforts to organize have increased union membership. The sample result show that 68 of the workers belonged to unions. State the null hypothesis Ho and alternative hypothesis Ha. (2.5 pts)Consider the null hypothesis Ho: The man is innocent of crime. Ha: The man is guilty of crime.
What is the Type I error? (2.5 pts)What is the Type II error? (2.5 pts)Using a random sample of n = 36, the sample mean is x ̅ = 2.92. Suppose that the population standard deviation is σ=0.18.Is the above statistical evidence sufficient to make the following claim:μ<3at the 5% level of significance?
Write the null hypothesis Ho and alternative hypothesis Ha. (2.5 pts)Calculate the standard error. (2.5 pts)Calculate the z score. (2.5 pts)Calculate the p value. (2.5 pts)What is the conclusion? (2 pts)Using a random sample of n = 50, the sample mean is x ̅ = 297.6. Suppose that the population standard deviation is σ=12.Is the above statistical evidence sufficient to make the following claim:μ>295 right tail, one tail at the 1% level of significance?
Write the null hypothesis Ho and alternative hypothesis Ha. (2.5 pts)Calculate the standard error. (2.5 pts)Calculate the z score. (2.5 pts)Calculate the p value. (2.5 pts)What is the conclusion? (2 pts)
Inwood College Regression Equation for Predicting Memory Scores Questions
I would like step-by-step solutions if you can, just answers are fine. I dropped the practice questions file. Thank you fo ...
Inwood College Regression Equation for Predicting Memory Scores Questions
I would like step-by-step solutions if you can, just answers are fine. I dropped the practice questions file. Thank you for your help and time, I really appreciate it.
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Mgsc 220 Final
Aircraft arrives at an airport with only one runway (Poisson process). An average of 6 aircrafts arrive at the airport eac ...
Mgsc 220 Final
Aircraft arrives at an airport with only one runway (Poisson process). An average of 6 aircrafts arrive at the airport each hour. What is the ...
Need help with this 2 tes
Question 1
A(n) ________ occurs when ________ independent variable(s) have an effect in combinati ...
Need help with this 2 tes
Question 1
A(n) ________ occurs when ________ independent variable(s) have an effect in combination with one another.
interaction; two or more
interaction; two or less
main effect; two or more
main effect; two or less
2.5 points
Question 2
Interested
in the effects of different kinds of instruction on videogame
performance, Martin asks 30 college freshmen to each play an hour of
Ratchet and Klank. Participants are randomly assigned to one of three
instruction groups: (1) complete the tasks as quickly as possible, (2)
conserve as much health as possible (i.e., play more carefully), or (3)
find gold bolts (worth lots of money in equipment and ammunition). If
Martin averages the scores for each instruction group and then compares
them, any differences in the means of the instruction groups reflect:
individual differences in hand-eye coordination.
inherent differences in the ability of the college freshmen to play video games.
within-groups variance.
between-groups variance.
2.5 points
Question 3
Why can't a researcher just run multiple t tests when the independent variable has more than two levels?
As you run more statistical tests, it becomes harder and harder to reject the null hypothesis.
As you run more statistical tests, the probability that you will make a Type I error in one of the tests increases.
As you run more statistical tests, you lose degrees of freedom.
As you run more statistical tests, the probability that you will make a Type III error in one of those tests increases.
2.5 points
Question 4
________ is a term used to describe an independent variable in a study with more than one independent variable.
Interaction
Main effect
Effect
Factor
2.5 points
Question 5
(Table:
Coping with Pain) The cells of this study reflect an interaction
between coping style and cognitive strategy. Which statement best
describes the interaction?
People
using both distraction and sensation-monitoring cognitive strategies
were able to keep their hand in the ice water for longer than 60
seconds, on average.
People using a sensation-monitoring strategy were able to keep their hand in the ice water for longer.
People using a distraction strategy were able to keep their hand in the ice water for longer.
The
effect of cognitive strategy depended on the coping style of the
participant. Those with an avoiding coping style kept their hand in the
ice water longer when using a distraction strategy, but those with a
monitoring coping style kept their hand in the ice water longer when
using a sensation-monitoring strategy.
2.5 points
Question 6
A five-way ANOVA has:
five dependent variables and two independent variables.
one dependent variable and five independent variables.
one dependent variable and four independent variables.
five dependent variables and five independent variables.
2.5 points
Question 7
The F ratio is calculated by:
dividing a measure of within-groups variability by a measure of between-groups variability.
averaging the results from the t tests for all possible two-group comparisons.
dividing a measure of between-groups variability by a measure of within-groups variability.
initially squaring all the scores.
2.5 points
Question 8
According to Cohen's conventions, an R2 of 0.19 is considered to be a(n) ________ effect size.
small
medium
large
erroneous
2.5 points
Question 9
Given
a scale dependent variable and a nominal independent variable with
three or more levels, we could use a(n) ________ to analyze the data.
PRE test
z test
t test
ANOVA
2.5 points
Question 10
A researcher wants to statistically test whether gender affects math test scores. Which test should the researcher use?
one-way ANOVA
two-way ANOVA
three-way ANOVA
within-groups ANOVA
2.5 points
Question 11
In a two-way ANOVA, the researcher makes decisions regarding ________ null hypotheses.
three separate
two separate
three interdependent
two interdependent
2.5 points
Question 12
A
researcher wants to examine people's preference for pets by having 10
people act as “foster owners” for four different types of family pets:
dogs, cats, birds, and fish. The participants will foster each type of
pet for one week, and a scale measure will be used to assess preference.
What research design should be used?
one-way between-groups ANOVA
correlation
one-way within-groups ANOVA
paired-samples t tests
2.5 points
Question 13
The F ratio is a ratio of:
two (or more) sample means.
two variances.
sample means divided by sample variances.
two sum-of-squares estimates.
2.5 points
Question 14
A post-hoc test is warranted when:
the F is significant and there are more than two groups.
we fail to reject the null hypothesis in an ANOVA.
we reject the null hypothesis when performing an independent-groups t test.
we have an a priori prediction about which group means will differ.
2.5 points
Question 15
A hypothesis test with two nominal independent variables and a scale dependent variable is a:
one-way ANOVA.
two-way ANOVA.
two-groups t test.
two-groups z test.
2.5 points
Question 16
A within-groups ANOVA is used when we have ________ independent variable(s) with ________ levels.
1; more than 2
2; more than 2
1; less than 2
2; less than 2
2.5 points
Question 17
Which degrees of freedom value is unique to the one-way within-groups ANOVA?
between-groups
subjects
within-groups
total
2.5 points
Question 18
The Bonferroni, Scheffé, and Tukey are all examples of:
hypothesis tests.
post-hoc tests.
effect size statistics.
confidence intervals.
2.5 points
Question 19
In Zinman and Zitzewitz's (2009) research on snowfall reports, they found the following interaction:
the amount of snowfall reported by resorts was always exaggerated, but that phenomenon was even greater on the weekends.
weekday snow reports were less interesting to skiers than weekend reports.
snowfall reports were more common during weekends than weekdays, but this was even more true when there was fresh snow.
snowfall
reports were exaggerated, and this was more pronounced for the weather
reports provided by radio stations compared to resorts.
2.5 points
Question 20
A
researcher is interested in whether circadian rhythms influence
participants' performance on different kinds of memory tests. The
researcher first classifies participants according to whether each is a
morning person or evening person. The researcher then randomly assigns
participants to receive either an implicit memory test or an explicit
memory test. The researcher next tests everyone at 8 A.M. How many cells
does this study have?
2
4
6
8
2.5 points
Question 21
The z, t, and F calculations have something in common: the numerator of the test statistic:
contains a measure of difference among groups.
contains a measure of sample variability.
is a squared number.
represents what would be expected to happen by chance.
2.5 points
Question 22
The assumptions for all ANOVAs are the same and include all of the following EXCEPT:
random selection of participants
population is normally distributed
population variances are equal
participants are all different across conditions
2.5 points
Question 23
________ is the proportion of variance in the dependent variable that is accounted for by the independent variable.
t
Cohen's d
R2
z
2.5 points
Question 24
According to Cohen's conventions, an effect size of 0.019 for a one-way within-groups ANOVA is considered to be:
small.
medium.
medium-to-large.
large.
2.5 points
Question 25
Forys
and Dahlquist (2007) investigated the effects of coping style and
cognitive strategy on dealing with pain. Participants were first
classified as having a monitoring or avoiding coping style. Participants
were then randomly assigned to one of two cognitive strategy
conditions, distraction or sensation monitoring. Participants were next
instructed to use the cognitive strategy while submerging their hand in
ice water. The researchers measured pain tolerance as the number of
seconds participants were able to keep their hand in the ice water. How
would you label the ANOVA used to analyze this data?
4 × 2 between-groups ANOVA
4 × 2 within-groups ANOVA
2 × 2 between-groups ANOVA
2 × 2 within-groups ANOVA
2.5 points
Question 26
Identify the correct formula for degrees of freedom between-groups:
Ngroups – 1
n – 1
Ntotal – 1
n – 2
2.5 points
Question 27
A
researcher is interested in whether circadian rhythms influence
participants' performance on different kinds of memory tests. The
researcher first classifies participants according to whether each is a
morning person or an evening person. The researcher then randomly
assigns participants to receive either an implicit memory test or an
explicit memory test. The researcher then tests everyone at 8 A.M. How
would you label the ANOVA used to analyze these data?
4 × 2 between-groups ANOVA
4 × 2 within-groups ANOVA
2 × 2 between-groups ANOVA
2 × 2 within-groups ANOVA
2.5 points
Question 28
A measure of the differences among group means is:
the z score.
between-groups variance.
within-groups variance.
the proportionate reduction in error.
2.5 points
Question 29
An interaction occurs when:
the dependent variable does not depend on any of the independent variables.
two independent variables both influence the dependent variable.
the effects of one independent variable depend on the level of the other independent variable.
a single independent variable changes the dependent variable, disregarding all other variables in the study.
2.5 points
Question 30
F is obtained by dividing ________ by ________.
SSbetween; dfbetween
MSbetween; MSwithin
dfbetween; SSbetween
SSbetween; SSwithin
2.5 points
Question 31
In
addition to assessing whether each independent variable has an effect
on the dependent variable, a factorial ANOVA also allows you to:
use multiple dependent measures in a single analysis.
control
for a third variable that might be related to the dependent measure,
prior to investigating the independent variable of interest.
determine whether the effects of one factor depend on the other factor.
partition out the variability due to individual differences and the variability due to measurement error.
2.5 points
Question 32
Heteroscedastic populations are those that:
have the same variance.
have homogeneity of means.
share common means.
have different variances.
2.5 points
Question 33
According to Cohen's conventions, an effect size of 0.29 for a one-way within-groups ANOVA is considered to be:
small.
medium.
medium-to-large.
large.
2.5 points
Question 34
An effect size of 0.015 for a two-way ANOVA is considered to be:
small.
medium.
large.
an error.
2.5 points
Question 35
If you calculate an F statistic and find that it is negative, then you know that:
the within-groups variance exceeds the between-groups variance.
the difference among the group means is greater than what would have occurred by chance.
you have made a calculation error.
the difference among the group means is less than what would have occurred by chance.
2.5 points
Question 36
A
boarding school (where students live and go to school) wants to find
out if students’ scores on a Happiness Rating Scale change over the
course of their first year. To this end, they administer the rating
scale to students during the first week, and again at the end of the
school year. Which type of t-test should the school staff use to test
whether there is a significant change in happiness ratings?
t-test for independent means
one-sample (single sample) t-test
t-test for dependent means
a combination of all 3.
2.5 points
Question 37
If
the results of a two-tailed t-test were to be presented in a research
article, and there were 25 participants, what is the appropriate number
in parentheses after the t?
t(25)
t(1)
t(2)
t(24)
2.5 points
Question 38
A
community psychologist observes that children in a certain school tend
to score lower on standardized math tests than students at other schools
in the district. He knows that the mean scores of children in the
district as a whole is 110. Which type of t-test should he use to
determine whether the scores of the children in the school differ
significantly from the scores in the school district overall?
t-test for independent means
one-sample (single sample) t-test
t-test for dependent means
none of the above
2.5 points
Question 39
A
psychologist publishes a paper based on a study and states that the
results are significant at the .05 level. Based on this information,
which of the following could be the p value of the results of the study?
.045
.4
.104
.06
2.5 points
Question 40
A
social psychologist wants to test whether introverts and extroverts
have different numbers of friends on a social networking site. She
administers a personality test and, based on the results, divides the
participants into 2 groups, Introverts and Extroverts. She then surveys
the groups to find out how many friends they have recorded on the social
networking site. Which type of t-test should she use to analyze the
results?
t-test for independent means
one-sample (single sample) t-test
t-test for dependent means
It doesn’t matter, any of them should work.
Miami Dade College Looking at Statistics Discussion
The internet is host to a wealth of information and much of that information comes from raw data that have been collected ...
Miami Dade College Looking at Statistics Discussion
The internet is host to a wealth of information and much of that information comes from raw data that have been collected or observed.Many websites summarize such data using graphical methods discussed in this chapter.Find a website related to your major that summarizes data and uses graphs, and share it with the class. Let us know how it relates to your major and why it is of interest to you.
Columbia Southern University Statistics Questionnaire
Problems need to include all required steps and answer(s) for full credit. All answers need to be reduced to lowest terms ...
Columbia Southern University Statistics Questionnaire
Problems need to include all required steps and answer(s) for full credit. All answers need to be reduced to lowest terms where possible. If showing the answer in %, have two decimal places.Answer the following problems showing your work and explaining or analyzing your results. Submit your work in a typed Microsoft Word document.A restaurant leaves a fishbowl on the counter for diners to drop their business cards. Once a month, a business card is pulled out to award one lucky diner with a free meal. Identify which type of sampling is used and why. (2 pts)A test of the effectiveness of a new curriculum could begin by dividing an area by school district, then choosing a school or set number of schools at random and sampling students from each. Identify which type of sampling is used and why. (2.5 pts)A survey about timekeeping might divide the population by time zone, then take 100 random samples per zone. Identify which type of sampling is used and why. (2.5 pts)A local TV station conducts an “Instant Poll” to predict the winner in the upcoming mayoral election. Evening news viewers were invited to phone in their votes, with the results to be announced on the late-night news. Based on the phone calls, the station predicted that Joseph Serra would win the election with 52% of the vote. They were wrong: Serra lost, getting only 46% of the vote. This faulty prediction may be the consequence of what kind of bias? (2.5 pts)According to Abyss Consulting, the average age of viewers of “America’s Got Talent” is 25 years old. However, the producer of the show thinks it is higher than 25.
Write the null hypothesis Ho and alternative hypothesis Ha. (2.5 pts)Is this a right-tailed, left-tailed, or two-tailed test? (2 pts)A research analyst believes that average back-to-school spending is less than a trade group’s prediction of $606.
Write the null hypothesis Ho and alternative hypothesis Ha. (2.5 pts)\Is this a right-tailed, left-tailed, or two-tailed test? (2 pts)\A study found that, in 2005, 12.5% of workers belonged to unions. Suppose a sample of 400 workers is collected in 2006 to determine whether union efforts to organize have increased union membership. The sample result show that 68 of the workers belonged to unions. State the null hypothesis Ho and alternative hypothesis Ha. (2.5 pts)Consider the null hypothesis Ho: The man is innocent of crime. Ha: The man is guilty of crime.
What is the Type I error? (2.5 pts)What is the Type II error? (2.5 pts)Using a random sample of n = 36, the sample mean is x ̅ = 2.92. Suppose that the population standard deviation is σ=0.18.Is the above statistical evidence sufficient to make the following claim:μ<3at the 5% level of significance?
Write the null hypothesis Ho and alternative hypothesis Ha. (2.5 pts)Calculate the standard error. (2.5 pts)Calculate the z score. (2.5 pts)Calculate the p value. (2.5 pts)What is the conclusion? (2 pts)Using a random sample of n = 50, the sample mean is x ̅ = 297.6. Suppose that the population standard deviation is σ=12.Is the above statistical evidence sufficient to make the following claim:μ>295 right tail, one tail at the 1% level of significance?
Write the null hypothesis Ho and alternative hypothesis Ha. (2.5 pts)Calculate the standard error. (2.5 pts)Calculate the z score. (2.5 pts)Calculate the p value. (2.5 pts)What is the conclusion? (2 pts)
Inwood College Regression Equation for Predicting Memory Scores Questions
I would like step-by-step solutions if you can, just answers are fine. I dropped the practice questions file. Thank you fo ...
Inwood College Regression Equation for Predicting Memory Scores Questions
I would like step-by-step solutions if you can, just answers are fine. I dropped the practice questions file. Thank you for your help and time, I really appreciate it.
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