1. Distinguish between the two categories of multiple-comparisons tests: a priori and post hoc.
2. For Durkheim's modernization and suicide data (problems 1 and 2), make all possible pairwise comparisons and write a conclusion telling what the data show
problem 1
The best way to cure phobias is known. Bandura, Blanchard, and Ritter (1969) conducted an experiment that provided individuals with one of four treatments for their intense fear of snakes. One group worked with a model-a person who handled a 4-foot king snake and encouraged others to imitate her. One group watched a film of adults and children who enjoyed progressively closer contact with a king snake. A third group received desensitization therapy, and a fourth group served as a control, receiving no treatment. The numbers of snake-approach responses after treatment are listed in the table. Name the independent variable and its levels. Name the dependent variable. Compute SStot, SStreat and SSerror.
|
Model
|
Film
|
Desensitization
|
Control
|
|
29
|
22
|
21
|
13
|
|
27
|
18
|
17
|
12
|
|
27
|
17
|
16
|
9
|
|
21
|
15
|
14
|
6
|
Problem 2
Perform an F test on the modernization and suicide data in problem 1 and write a conclusion.