Problem Set 1: The Two-Factor ANOVA for Independent Measures
Research Scenario: In response to recent Gallup and Pew Center polls of Americans’ trust in their political leaders (http://www.gallup.com/poll/195716/americans-trust-political-leaders-public-new-lows.aspx; http://www.people-press.org/2014/11/13/public-trust-in-government/), a social psychologist decides to study people’s trust in politicians among different political parties and regions in his state. The psychologist administers a scale-level questionnaire with possible scores ranging from 1-50, with higher scores indicating higher trust in politicians, and lower scores indicating lower trust. The data from this scale-level questionnaire are shown in the table below.
Conduct a two-way ANOVA to determine the effect of political party and region on trust in politicians. Create a multiple line graph to display the differences between the groups. Follow the directions below the table to complete the homework.
| Urban | Rural | |
| Republican | 16
32 29 18 18 |
19
28 29 37 26 |
| Democrat | 35
36 27 39 22 |
24
19 14 26 30 |
| Libertarian | 12
16 10 27 19 |
9
13 7 25 12 |
| Independent | 27
17 23 21 12 |
15
16 26 25 13 |
Problem Set 2: The Two-factor ANOVA for Independent Measures
Research Scenario: A social worker practicing in a low-income, high-risk area wants to implement a conflict-resolution program in her community. In working towards this goal, she decides to examine the effects of different types of prevention programs for building effective communication skills for 8th grade students in her local school. She develops two types of programs, one based on a traditional lecture and reading format, and one based on interactive role-play during sessions. She also wants to know whether it’s more effective to deliver this type of program during class hours or in an after-school program. Students in one 8th grade class are randomly assigned to one of the four conditions. After 6 months of the program, they are assessed on a measure of effective communication skills where higher scores indicate more effective communication skills.
Using this table, enter the data into a new SPSS data file and run a two-way ANOVA to test whether there is an effect of program type and program setting on communication skills. Create a multiple line graph to display the differences between the groups. Follow the directions below the table to complete the homework.
| Lecture | Role-Play | |
|
In-Class |
3
4 11 5 10 9 |
11
14 13 6 12 |
|
After-School |
11
6 9 10 9 |
13
10 12 9 15 |
Submit this assignment by 11:59 p.m. (ET) on Monday at the end of Module/Week 4.
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