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Section 1
Raw Scores z Scores
55
-2.74
65
-1.29
68
-0.86
69
-0.72
70
-0.57
70
-0.57
70
-0.57
72
-0.28
73
-0.14
74
0.01
74
0.01
76
0.30
76
0.30
78
0.59
78
0.59
80
0.87
80
0.87
82
1.16
83
1.31
86
1.74
74.0 Mean
74 Median
6.92 St.dev.
Section 2
Raw Scores z Scores
75
-1.56
77
-1.16
78
-0.95
79
-0.75
79
-0.75
79
-0.75
80
-0.55
80
-0.55
81
-0.34
81
-0.34
82
-0.14
82
-0.14
83
0.06
84
0.26
84
0.26
86
0.67
88
1.07
90
1.48
92
1.89
94
2.29
82.7 Mean
81.5 Median
4.93 St.dev.
We will assume these are population data.
Stressful Life Events Inventory
Participant
SLEI z Scores
-0.22
1
30
-1.76
2
23
-0.66
3
28
-0.22
4
30
1.10
5
36
0.00
6
31
0.88
7
35
1.76
8
39
0.22
9
32
-1.10
10
26
31 mean
4.54 st.dev.
Major Stressors Questionnaire
Participant
MSQ z Scores
-0.39
11
113
0.00
12
115
-0.97
13
110
0.58
14
118
0.97
15
120
0.78
16
119
-0.19
17
114
-2.13
18
104
-0.19
19
114
1.55
20
123
115 mean
5.16 st.dev.
We will assume these are population data.
1
You will look for a peer-reviewed journal research article using Psi Chi Journal of Undergraduate
Research (Links to an external site.). This is the only journal website you are allowed to use. You
will choose ONE research article that describes an experiment (this is a MUST!). Remember that
an experiment is where researchers have at least one experimental and control group; and
researchers manipulate the independent variable, where the experimental group is getting
some kind of treatment and the control group does not. Discussing a correlational study will
result in an automatic zero for this assignment. The research article must be recent, as in within
the last year. Your one research article MUST come from Volume 27, Spring 2022, OR Volume
26, Winter 2021, OR Fall 2021, OR Summer 2021, OR Spring 2021. The last requirement is that
you must choose an article that is different from your classmates'. There are lots of articles to
choose from so I expect you to choose different ones. Check the discussion before picking your
article to see if someone has already written about that article and make sure to choose a
different one.
HINT: Please make sure to choose a research article that you are willing to read and analyze.
Also, before answering the questions below, make sure that you fully understand the
experiment that was conducted and why.
Journal articles are usually divided into sections: Introduction, Methods, Results, and
Discussion. The introduction generally outlines the rationale for the study, the literature review,
and research question(s) and/or hypotheses. The methods section typically outlines how the
study was conducted: the materials, design, participants, operational definitions of
independent and dependent variables. The results section reports the descriptive and
inferential statistical analyses. The discussion section translates the statistical analyses into
understandable language. It also provides implications of the study and next steps.
Once you have chosen, read, and annotated your peer-reviewed journal article (most likely will need to
read it more than twice), you will provide answers to the questions below. Please make sure to provide
the link or upload the PDF document for your article.
Click on the "Reply" button and type in your answers to the following questions.
Who is/are the author(s) of this article? What is the title of the article? When was it published (include
Volume #, & page #s)?
Introduction Section (All of your answers to the questions below MUST be summarized and in your own
words.)
What are the two or three main things you learned from the introduction? What is/are the
hypothesis(es) of the study?
How many participants were in the study? Who were the participants (e.g., college students, older
adults, infants, etc.)? Please make sure to include demographics, such as age, ethnicity, etc.
What were the independent and dependent variables?
Methods Section (All of your answers to the questions below MUST be summarized and in your own
words.)
What materials were used in the study? Did the participants compete a survey, use a computer
program, were they interviewed, etc.?
Briefly summarize what the participants did. If more than one experiment was conducted, just
summarize one of them.
Results Section (All of your answers to the questions below MUST be summarized and in your own
words.)
How were the data analyzed (i.e., what statistical analyses were used)?
Did the author(s) find significant results? Briefly explain what the authors found.
What did you learn from the figure (or table, or graph) in the results section?
Discussion Section (All of your answers to the questions below MUST be summarized and in your own
words.)
Was/Were the hypothesis(es) supported?
Were the results consistent with the previous literature discussed in the introduction?
What can you conclude from this study?
Did the author(s) make any suggestions for further investigation? If so, what suggestion(s) was made?
What did you think of the article?
Was it an effective study? Do you accept the results? Why or why not?
Don't forget to include a link to the article or a PDF upload.
2
Assessment 3
Task: For this learning activity, we will be using the Assessment 3 Data Excel file and the Unit Normal
Table to look up z-scores and probabilities, which you will find in Chapter 6 Module under Learning
Activities. You will need access to a computer with Microsoft Excel and Word. Remember that everyone
has access to Office 365 (which includes Microsoft Excel and Word) in our Canvas course in the left
navigation. If you choose to use Google Docs, please make sure to download your file into a Word
document (.docx).
Two sections in History classes were given an academic aptitude test. The raw scores and z-scores for
each group are presented in the Assessment 3 Data Excel file. Open the Assessment 3 Excel file and look
over the raw scores and z-scores for each section in the History Scores tab. Also, look over the means
and standard deviations for each section.
Briefly describe each section (shape, typical value, and spread). Which group is more consistent with
respect to academic aptitude as measured by the test? Briefly explain your answer.
Other factors being equal, which group would you predict to have the higher average score on the final
exam in the course? Briefly explain your answer.
In Sections 1 & 2, are there scores that are more than 2 standard deviations above the mean or 2
standard deviations below the mean? If yes, which score(s) and which section(s)?
The scores for 10 persons on the Stressful Life Events Inventory (SLEI) and the scores for 10 other
persons on the Major Stressors Questionnaire (MSQ) are presented in the Assessment 3 Data Excel file
in the Stress Scores tab. For both surveys, higher scores mean that the person has experienced more
stressors recently, suggesting a greater risk for stress-related symptoms such as acute anxiety attacks.
Open the Assessment 3 Data Excel file and look over the SLEI and MSQ raw scores and z-scores in the
Stress Scores tab.
Please take a look at Participant 5 and 15 raw scores and z-scores. Who is at the greatest risk for acute
anxiety attacks, Participant 5 or 15? Please make sure to briefly explain your answer based on the zscores.
What is the probability that someone will score higher than 36 on the SLEI? Is this unusual? Why or why
not? What is the probability that someone will score higher than 123 on the MSQ? Is this unusual? Why
or why not? (Please make sure to look up probabilities in the Unit Normal Table in Appendix B)
What is the probability that someone will score lower than a 23 on the SLEI? Is this unusual? Why or
why not? What is the probability that someone will score lower than a 104 on the MSQ? Is this unusual?
Why or why not? (Please make sure to look up probabilities in the Unit Normal Table in Appendix B)
The tables below provide probabilities for bags of Skittles. For each of the tables below, you will need to
identify and state whether the tables are probability models or not and explain why or why not, using
the probability rules that were discussed in Chapter 6 lecture videos.
3A. Is the table below a probability model? Why or why not? Explain using probability rules.
Color, Probability
Red, 1.01
Green, .1
Orange, .2
Yellow, .5
Purple, .3
3B. Is the table below a probability model? Why or why not? Explain using probability rules.
Color, Probability
Red, .3
Green, -.2
Orange, .4
Yellow, .6
Brown, .2
3C. Is the table below a probability model? Why or why not? Explain using probability rules.
Color, Probability
Red, .19
Green, .22
Orange, .21
Yellow, .20
Purple, .18
3D. Is the table below a probability model? Why or why not? Explain using probability rules. Also, what
does this table of probabilities imply?
Color, Probability
Red, 0
Green, 0
Orange, 1
Yellow, 0
Brown, 0
4. Girl Scout Cookies: The following table shows the distribution of the most popular selling Girl Scout
Cookies.
Cookie Type, Probability
Thin Mints, .37
Caramel DeLites (aka Samoas), .28
Peanut Butter Patties (aka Tagalongs), .15
Peanut Butter Sandwich (aka Do-Si-Dos), .12
Shortbread (aka Trefoils), .08
Is this a probability model? Why or why not? Explain using probability rules.
If a girl scout is selling cookies to people who randomly enter a shopping mall, what is the probability
that the next 2 boxes sold will be Trefoils and Samoas? Interpret this probability.
If a girl scout is selling cookies to people who randomly enter a shopping mall, what is the probability
that the next box sold will be Thin Mints, Do-Si-Dos, or Tagalongs? Interpret this probability.
What is the probability that the next box sold will not be Samoas? Interpret this probability.
Please fill in the blanks for each of the following sentences.
5. If an entire population IQ scores with µ = 100 and σ = 15 is transformed into z-scores, then the
distribution of z-scores will have a mean of ________ and a standard deviation of ________.
6. One of the central ideas about probability is that chance behavior has a regular and predictable
pattern in the __________ run, but has an unpredictable pattern in the __________ run.
7. Roughly __________ of the total area under the normal curve is within three standard deviations of
the mean.
Criteria for Success:
Interpretation of z-scores and corresponding probabilities are provided
Probability models are evaluated for appropriateness and explanations are provided
Probabilities are calculated and interpreted accurately
Analysis and interpretations are reported in such a way that someone with no statistical background
would understand
3
Assessment 4
Task: For this learning activity, we will be using the Unit Normal Table to look up z-scores and
probabilities, which you will find in Chapter 8 Module under Learning Activities. You will need access to
a computer with Microsoft Word. Remember that everyone has access to Office 365 (which includes
Microsoft Word) in our Canvas course in the left navigation. If you choose to use Google Docs, please
make sure to download your file into a Word document (.docx).
A population of statistics students reported the typical number of hours that they sleep, on average,
every night. This distribution is normally distributed with a mean of 6.8 (µ = 6.8 hours) and a standard
deviation of 1.03 (σ = 1.03 hours).
What percent of statistics students sleep more than 7.5 hours? Is this unusual? Please briefly explain
why or why not.
What is the lowest number of sleep hours that would place students in the top 10% of this distribution?
A random sample of 25 students is drawn from this population. What is the probability that the mean
hours of sleep is greater than 7.5 hours? Is this unusual? Please briefly explain why or why not.
Based on a particular theory of creativity, a researcher predicts that artists will be greater risk takers
than the general population. The general population is normally distributed with a mean of µ = 50 and a
standard deviation of σ = 12 on a risk-taking questionnaire. The researcher obtains a sample of n = 36
artists and the sample data produced a sample mean of M = 55. Does this sample of artists provide
enough evidence to conclude that artists are greater risk takers than the general population?
State the null and research (alternative) hypotheses in words and using symbols. Conduct the
appropriate hypothesis test with a = .05 and state your conclusion in terms of this problem. Make sure
to write conclusions in APA format as shown in lecture videos. Don't forget to include confidence
interval and effect size, if applicable.
Please fill in the blanks for each of the following sentences.
3. Suppose that a professor randomly assigns students to study groups of n = 4 students. The final exam
in the professor's class has a mean of µ = 78 and σ = 6. This distribution of study group means will have
an expected mean value of __________ and a standard error of __________.
4. The boundaries for the critical region are determined by ______________.
5. If a hypothesis test is found to have power = 0.80, then the probability of a Type II error for that same
test is __________.
6. For each of the following examples, identify whether the research has expressed a directional of nondirectional hypothesis:
a. A researcher is interested in studying the use of antibacterial products and the dryness of people's
skin. They think these products might alter the moisture in skin compared to other products that are not
antibacterial.
b. A student wonders if grades in a class are in any way related to where a student sits in the classroom.
In particular, do students who sit in the front row get better grades, on average, than the general
population of students?
c. Cell phones are everywhere and we are now available by phone almost all of the time. Does this
translate into a change in the nature of closeness of our long-distance relationships?

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Anonymous

Just what I was looking for! Super helpful.