PSY 230 for Liam Garry
Project #2: Analysis of Variance (adopted from Green & Salkind, 2008) This is a partner project and as such, you may work as a team to complete this project. You will turn in ONE paper to me with both of your names. The project is due by midnight via email ([email protected]) on the last day of class (this is the class period before the final exam – NOT final exam night). Begin by working through the practice problems guide that I have posted to Canvas. This will help you learn the different features of SPSS and how to conduct a one-‐way ANOVA. You will use the Tutorial Example Dataset for the practice problems. You will not turn this part in. It is only for your benefit. I suggest working through it early so that if you have questions you can ask me for help. Next, you will download 2 datasets from Canvas (Lab 10 and Lab 9). These will help you with the problems that follow. Please type your results and format appropriately. You may wish to refer to your textbook for how to report ANOVA results in accordance with APA. Please refer to my table formatting guide for additional information per formatting in APA. Problem #1 – (Lab 10 file)
Marvin is interested in whether blonds, brunettes, and redheads differ with respect to their extrovertedness (i.e., how outgoing they are). He randomly samples 18 women from his local college campus: six blonds, six brunettes, and six redheads. He then administers a measure of social extroversion to each individual.
1. Conduct a one-‐way ANOVA to investigate the relationship between hair color and social extroversion. Be sure to conduct appropriate post hoc comparison tests. On the output, identify and report the following (note: you don’t have to create a table): a. F ratio for the group effect b. Sums of squares for the hair color effect c. Mean for redheads d. p value for the hair color effect
2. What is the effect size for the overall effect of hair color on extroversion? 3. Write an APA results section to explain your results.
Problem #2 – (Lab 9 file)
Karin believes that students with behavior problems react to teachers who have a
humanistic philosophy and have firm control of their classrooms. In a large city school system, she classifies 40 high school teachers of students with behavior problems into three categories: humanists with firm control (group 1, n = 9); strict disciplinarians (group 2, n = 21), and keepers of the behavior problems (group 3, n = 10). Karen is interested in assessing whether students who are taught by one type of teacher as opposed to another type of teacher are more likely to stay out of difficulty in school. By reviewing the records of all students in these 40 teachers’ classes, she determines the number of times the
students of each teacher were sent to the main office for disciplinary action during the second half of the academic year. All classes had 30 students in them. Karen’s SPSS data file has 40 cases with a factor distinguishing among the three types of teachers and a dependent variable, the number of disciplinary actions for students in a class.
1. State the null and alternative hypothesis. 2. Conduct a one-‐way analysis of variance examining whether teaching style
contributes to whether a student stays out of difficulty in school. 3. What is the effect size for the overall effect of teaching style on number of
disciplinary actions? 4. Conduct and interpret all appropriate post-‐hoc pairwise comparison tests. 5. Create a boxplot to display the differences among the three teaching style groups. 6. Write a results section based on the analyses you conducted.