Homework 9

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gpenva

Mathematics

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There are 10 research examples in this handout. You are required to answer questions 1-4 for each research example. Questions 5-10 are for your review only. You do not have to answer those questions but this information will be required on the final exam. Each part will allow you to practice identifying the necessary information for the final. On the final, you will be expected to answer all the questions.

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Final Examples and Practice Homework 9 There are 10 research examples in this handout. You are required to answer questions 1-4 for each research example. Questions 5-10 are for your review only. You do not have to answer those questions but this information will be required on the final exam. Each part will allow you to practice identifying the necessary information for the final. On the final, you will be expected to answer all the questions. Questions: 1. What are the researcher’s independent and dependent variables? a. Independent: b. Dependent: 2. What are the null and alternative hypotheses (use the appropriate symbols not words)? a. H0: b. H1: 3. What is the appropriate test for the researcher to use? 4. Why is that statistic appropriate? If applicable to the specific test to know for the final: 5. What are the test’s assumptions? 6. What are the test’s df? 7. What is the appropriate critical value? 8. If the research obtains a test statistic of ____ , would the researcher retain or reject H0? 9. Should the researcher do any follow up tests or make any graphs/charts? 10. Interpret the findings in APA style Homework 1. A researcher wants to know if people who do community service have higher levels of empathy than people who do no community service (CS). Participants are divided into three groups: 10+ hours of CS (n = 14), 1-10 hours of CS (n = 12), and no CS (n = 10). Each participant completes a measure of empathy in which scores can range from 0-100. 1. What are the researcher’s independent and dependent variables? a. Independent: Community Service b. Dependent: Empathy 2. What are the null and alternative hypotheses (use the appropriate symbols not words)? a. H0: μ1= μ2= μ3 b. H1: μ1≠ μ2 = μ3 3. What is the appropriate test for the researcher to use? One way ANOVA 4. Why is that statistic appropriate? Comparing three or more means 5. What are the test’s assumpTons? Normal DistribuTon and Equal Variance 6. What are the test’s df? N^Groups 7. What is the appropriate criTcal value? 8. If the research obtains a test staTsTc of 3.03, would the researcher retain or reject H0? 9. Should the researcher do any follow up tests or make any graphs/charts? ±urkey Post Hoc ±est 10. Interpret the Fndings in APA style 2. A research team has developed a new medication to treat ADHD. They think that their new medicine will be more effective than the current medication. The team asks local doctors to do a study in which newly diagnosed children with ADHD (n = 20) are matched with other children taking the current medication (n= 20) based on symptoms and physical attributes of the children. The research team will then test all the children after one year to determine the effectiveness of the treatments with a standardized symptom score-sheet (scores can range from 1-50). 1. What are the researcher’s independent and dependent variables? a. Independent: b. Dependent: 2. What are the null and alternative hypotheses (use the appropriate symbols not words)? a. H0: b. H1: 3. What is the appropriate test for the researcher to use? 4. Why is that statistic appropriate? 3. Researchers constructed an experiment to determine if boys and girls express aggression differently. Children were brought to the lab and placed into one of two conditions, physical aggression and verbal aggression. The researchers then determined if boys and girls responded differently to the types of aggression. The researchers expected that boys would respond to physical aggression with more negativity (1-10) than boys who experienced verbal aggression, whereas girls would respond to verbal aggression more negatively than girls who experienced physical aggression. 1. What are the researcher’s independent and dependent variables? a. Independent: b. Dependent: 2. What are the null and alternative hypotheses (use the appropriate symbols not words)? a. H0: b. H1: 3. What is the appropriate test for the researcher to use? 4. Why is that statistic appropriate? 4. A standardized test that assesses verbal abilities (scores range from 1-45) in the overall population in the U.S. has a mean of 25 and a variance of 2.7. This test was administered to early stage Alzheimer’s patients to determine if the standard test of verbal abilities could be used to detect symptoms of Alzheimer’s earlier than the current assessment tools. 150 Alzheimer’s patients in the earliest stage of Alzheimer’s were administered the standard verbal test to compare their scores to the general population. 1. What are the researcher’s independent and dependent variables? a. Independent: b. Dependent: 2. What are the null and alternative hypotheses (use the appropriate symbols not words)? a. H0: b. H1: 3. What is the appropriate test for the researcher to use? 4. Why is that statistic appropriate? 5. A research group is interested in determining if children of divorced parents related differently to authority figures than children of non-divorced parents. They administer a measure of resistance to authority figures (110). A total number of 45 participants completed the measures (20 divorced and 25 non-divorced). 1. What are the researcher’s independent and dependent variables? a. Independent: b. Dependent: 2. What are the null and alternative hypotheses (use the appropriate symbols not words)? a. H0: b. H1: 3. What is the appropriate test for the researcher to use? 4. Why is that statistic appropriate? 6. Dr. Hughes researches the pattern of vending machine use on campus. He has found that two factors increase the use of vending machines (0-10) in college; one is time of the semester and one is time of day. He wants to determine if these two factors influence one another to form a more specific pattern of vending machine use. Dr. Hughes goes to several locations on campus to watch the use of vending machines. He records the time of day and the time within the semester. He later then transposes those times into groups (time of day 1=morning, 2=afternoon, 3=evening, 4=late night; time of semester 1=early, 2=late). 1. What are the researcher’s independent and dependent variables? a. Independent: b. Dependent: 2. What are the null and alternative hypotheses (use the appropriate symbols not words)? a. H0: b. H1: 3. What is the appropriate test for the researcher to use? 4. Why is that statistic appropriate? 7. A student researcher wanted to determine the relationship between the number of time students attend class (0-48) and their satisfaction with the class overall (1-10 scale). Twenty-six students participated in the study. They believe that the more students attend class the happier they will be with the class. 1. What are the researcher’s independent and dependent variables? a. Independent: b. Dependent: 2. What are the null and alternative hypotheses (use the appropriate symbols not words)? a. H0: b. H1: 3. What is the appropriate test for the researcher to use? 4. Why is that statistic appropriate? 8. Dr. Penner thinks that she can predict a person’s success at a spatial task from their Mental Ability Score (MAS). She asks 300 high-school students to complete the MAS (scores range from 10-50) and a series of spatial tasks (scores range from 0-15). She expects that with increased MAS high school students will be more successful at the spatial task. 1. What are the researcher’s independent and dependent variables? a. Independent: b. Dependent: 2. What are the null and alternative hypotheses (use the appropriate symbols not words)? a. H0: b. H1: 3. What is the appropriate test for the researcher to use? 4. Why is that statistic appropriate? 9. A group of concerned citizens are interested in whether home owners in area A (n = 22) pay more property taxes than home owners in area B (n = 24). They would like to compare the average amount of property tax paid (measured in dollars; minimum payment is $1) in each area. Each area has roughly 100 unique homes; for a total of 200 homes. 1. What are the researcher’s independent and dependent variables? a. Independent: b. Dependent: 2. What are the null and alternative hypotheses (use the appropriate symbols not words)? a. H0: b. H1: 3. What is the appropriate test for the researcher to use? 4. Why is that statistic appropriate? 10. Dr. Antonio believes that you can predict people’s choice of mate from their personal inventory of characteristics (PIC; measured 1-15). He administers the PIC to 100 students on campus and has those students rate the likelihood of dating a group of 10 co-eds (mate choice is measured on a 1-100 scale; 10 pts for each coed). 1. What are the researcher’s independent and dependent variables? a. Independent: b. Dependent: 2. What are the null and alternative hypotheses (use the appropriate symbols not words)? a. H0: b. H1: 3. What is the appropriate test for the researcher to use? 4. Why is that statistic appropriate?
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Running head: Homework 9

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Homework 9
Name
University Name
Course
Dec 2, 2017

Homework 9

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Final Exams and Practice

1.The independent variable is the community service which is categorical and divided into
three groups.The dependent variable, in this case, is the empathy score which ranges from 0100.
2.H0: The mean empathy scores across all groups are equal.
Ha: At least one of the mean empathy scores vary across the groups.
Ho:µ1=µ2=µ3
Ha:µ1≠µ2≠µ3
3.The appropriate test statistic is,”One way ANOVA.”
4.One way ANOVA is appropriate as we are comparing more than 2 groups.
5. Assumptions of one-way ANOVA are:
a)The response variable is approximately normally distributed.
b)The population variances are equal across groups.
c)Samples are independent.
6.
n=36 and k=3
Test degree of freedom =Between group df+Within group df = (3-1)+(36-3) =2+33 =35
7. Appropriate critical value =3.285, using Excel formula =F.INV.RT (0.05, 2,33)
8. The researcher should retain the n...


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