Question: When you read published research studies, you will find that many are experimental studies in which one or more variables are manipulated. An example is a study of whether students with windows in their classrooms give their instructors higher evaluations than students with no windows in their classrooms. You could compare these two groups with a t-test, which you studied in Week 4. Perhaps it would be more interesting to have additional levels of "scenery." You might compare instructor evaluations when students are in a class with no windows, a class with windows that look out to a parking lot, a class with windows that look out to a park, or a class with no windows but pictures of windows on the wall. Since you have multiple levels of the factor, scenery, you use an ANOVA instead of a t-test.

This assignment will give you practice interpreting a study with multiple levels of a factor. Since many research studies rely on the ANOVA for analysis, you will enhance your ability to understand the results of research studies that are of interest to you.

 Carefully review Chapter 13 in your text.

 Review the PowerPoint for Chapter 13.

 Consider the following study and data:

Katie is studying aggression among adolescent girls. She believes that there is a relationship between the level of interaction a girl has with her mother and her level of aggression. She has identified 5 girls who fall into each of 4 interaction levels and has measured their aggression scores. Her data are given below.

The summary table is as follows:

 What are the independent variable and the dependent variables?

 Should Katie conduct a between-subjects ANOVA or a within-subjects ANOVA? Explain your answer.

 How many factors are involved in Katie's study?

 How many levels are involved? Name the level(s).

 What are the null and alternate hypotheses?

 Using a = 0.05, what is F _crit ?

 Is the F-test significant?

 Based on your answer about significance, what else should you do and why?

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