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Module 3/Mod3_Lesson 25 Practice Data File 1.sav
Module 3/Module 3 Exercise File 1.sav
PSYC
35
5
SPSS Homework 2 Instructions: Independent Samples t Tests (40 points)
Part One:
Problem Set 1: The independent-samples t test
File: Open “Module 2 Exercise File 1” found in Blackboard Course Content (Course Guides and Assignment Instructions—Assignment Instructions—SPSS Homework—SPSS Homework 2 Files).
Research Scenario: A clinical psychologist wants to study the effect of session length on treatment satisfaction for adults in a community clinic who present with internalizing disorders. She randomly selects a sample of
20
clients and assigns them to two groups, a “Short session group” which receives ten
30
-minute sessions over 3 months (n =
10
), and a “Long session group” which receives seven
45
-minute sessions over 3 months (n = 10). Clients rate their satisfaction at the end of treatment on a scale of 1-10, with 1 being completely unsatisfied and 10 being completely satisfied. Conduct an independent-samples t test to determine whether there is a difference in treatment satisfaction depending on session length.
1. Paste SPSS output. (3 pts.)
2. Beneath your output, write the answers to the following questions:
a. What are the t and p values for “equal variances assumed”? (3 pts)
b. What is the mean satisfaction score for the “Short” group? (3 pts)
3. Write an APA-style Results section based on your analyses. All homework “Results sections” should follow the example given in the SPSS tutorials. Remember to include a decision about the null hypothesis. (3 pts.)
4. Create a boxplot to illustrate the difference between the treatment satisfaction levels of the two groups. (3 pts.)
Part Two:
Problem Set 1: The independent-samples t test
Research Scenario: A social psychologist working for a marketing department wants to study the effect of scenario descriptions on charitable giving to a child hunger organization. He devises two scenarios: one in which an employee of the charity describes child hunger using facts and information (Group 1), and one in which an employee of the charity describes child hunger using an anecdotal example with one “identifiable victim” (Small, 2016) (Group 2). Eight people are interviewed in each group. After hearing the employee read the child hunger scenario, the participants are then asked to state how much money they would donate to the charity to help end child hunger. The data appear in the table below. Conduct an independent-samples t test to determine whether there a difference in the amount of money between the two groups.
|
Factual Informative Scenario |
Anecdotal “Identifiable Victim” Scenario |
|
25 10 15 10 32 15 |
10 15 15 35 30 50 45 |
1. Paste appropriate SPSS output. (4 pts.)
2. Paste appropriate SPSS graph. (4 pts.)
3. Write an APA-style Results section based on your analyses. All homework “Results sections” should follow the example given in the SPSS tutorials. Remember to include a decision about the null hypothesis. (4 pts.)
Part Three: Cumulative Homework
Problem Set 1: Choose the correct method from tests learned in previous modules.
Research Scenario: A developmental psychologist is studying attachment in a sample of 10 toddlers in a local preschool. She uses a measure on which higher scores indicate more secure attachments to caregivers, and the data a. The population mean on this measure is
24.5
. Is there a difference between the psychologist’s sample and the general population on attachment security?
|
Attachment Security |
|
12.5 23 32 19.5 17 13.5 23 27.5 32 |
a. Paste appropriate SPSS output. (4)
b. Paste appropriate SPSS graph. (4)
c. Write an APA-style Results section based on your analyses. All homework “Results sections” should follow the example given in the SPSS tutorials and the Course Content document “Writing Results of Statistical Tests in APA Format” (note: you do not have to refer to a figure). Remember to include a decision about the null hypothesis.
Submit this assignment by 11:59 p.m. (ET) on Monday of Module/Week 2.
Page 3 of 3
PSYC 355
SPSS Homework 3 Instructions: One-Way ANOVA (40 points)
Note: Use Tukey’s test as a standard for post hoc tests in PSYC 355.
Part One:
Problem Set 1: One-way ANOVA
File: Open “Module 3 Exercise File 1” found in Blackboard Course Content (Course Guides and Assignment Instructions—Assignment Instructions—SPSS Homework—SPSS Homework 3 Files).
Research Scenario: A health psychologist is looking into the effects of different kinds of exercise on stress. She divides volunteers into three exercise groups: pilates (n = 6), swimming (n = 5), or biking (n = 5). The volunteers participate in a set number of hours of the exercise for a month, after which the psychologist measures their stress levels on a scale of 1-10 where lower scores = lower stress, and higher scores = higher stress. Conduct a one-way ANOVA to determine the effect of these different exercises on stress levels. Use Tukey’s test as the post hoc test for the ANOVA’s in 355.
1. Paste SPSS output (3 pts). Beneath the output, type the answers to the following questions:
a. What is the value of the F statistic for the main effect of exercise? (3 pts)
b. What is the effect size for the relationship between exercise and stress? This value is in the output (for review, see the section on effect size statistics in Lesson 25). (3 pts)
c. What is the mean of the pilates group? (3 pts)
2. Write an APA-style Results section based on your analysis. All homework “Results sections” should follow the example given in the SPSS tutorials and the Course Content document “Writing Results of Statistical Tests in APA Format” (note: you do not have to refer to a figure). Remember to include a decision about the null hypothesis. (3 pts)
3. Create a boxplot to display the difference among the distributions for the three exercise groups. Remember to put your dependent variable in the “variable” box, and your independent, or grouping, variables in the “category axis” box. (3 pts.)
Part Two:
Problem Set 1: One-way ANOVA
Research Scenario: Twenty-four male adolescents who have been diagnosed with conduct disorder with a callous-unemotional presentation (CD-CU) are randomly assigned to one of 3 group therapy conditions: interpersonal problem-solving skills training only (IPST), parent training only (PT), and a combination of the two (IPST + PT). Following six months of therapy, the participants are assessed using the Inventory of Callous Unemotional Traits (ICU; Frick, 2004). On this instrument, scores at or above 27 indicate higher levels of conduct problems and callous-unemotional traits. The scores for each group are shown in the table below. Conduct a one-way ANOVA to determine whether there is a significant difference in ICU scores between the three therapy conditions.
(The steps will be the same as the ones you have been practicing in Part One of the assignment—the only difference is that you are now responsible for creating the data file as well. Remember to name and define your variables under the “Variable View,” then return to the “Data View” to enter the data.)
|
IPST |
30, 25, 26, 31, 29, 24, 32, 35 |
|
PT |
29, 21, 28, 32, 25, 27, 29, 30 |
|
IPST + PT |
19, 19, 24, 30, 26, 23, 27, 28 |
1. Paste SPSS output. (3 pts)
2. What is the F ratio for the therapy group main effect? (3 pts)
3. What is the effect size for the overall effect of therapy type on ICU scores? According to general conventions, is this effect small, medium, or large? (See Effect Size Statistics section in Lesson 25 for conventions for partial eta squared.) (3 pts)
4. Write an APA-style Results section based on your analysis. All homework “Results sections” should follow the example given in the SPSS tutorials and the Course Content document “Writing Results of Statistical Tests in APA Format” (note: you do not have to refer to a figure). Remember to include a decision about the null hypothesis. (3 pts)
Part Three: Cumulative Homework
Problem Set 1: Choose the correct method from tests learned in previous modules.
Research Scenario: A professor wants to determine how grades are affected by cooperation versus competition in classroom assignments. She randomly divides the class into two groups and gives them the same assignment. Group 1 (n = 10) is given instructions that encourage cooperating with fellow classmates to complete the assignment, and Group 2 (n = 9) is given instructions that encourage competing with fellow classmates to complete the assignment. She then collects and scores the assignments (total possible points = 100). Assume all other variables are controlled for in the study. Choose the correct test to evaluate the claim that there is a difference in scores between the two groups.
Cooperation
Competition
88
91
73.5
82
84
92.5
76
95
98
81.5
92
87
85
79
91
95.5
72.5
74
63
a. Paste appropriate SPSS output. (3 pts)
b. Paste appropriate SPSS graph. (3 pts)
c. Write an APA-style Results section based on your analyses. All homework “Results sections” should follow the example given in the SPSS tutorials and the Course Content document “Writing Results of Statistical Tests in APA Format” (note: you do not have to refer to a figure). Remember to include a decision about the null hypothesis. (4)
Submit this assignment by 11:59 p.m. (ET) on Monday of Module/Week 3.
Page 3 of 3
Module 2/Mod2_Lesson 24 Practice Data File 1.sav
Module 2/Module 2 Exercise File 1.sav
