1. ANOVA is based on two assumptions about the populations the samples are from. List them
2. What is the advantage of random assignment of participants to treatments in an experiment?
3. For the data from Bandura and colleagues' phobia treatment experiment (problems 3, 2, and 1), find f and write a sentence of interpretation.
Problem 1
For the data on treatment of phobias (problems 3 and 2), compare the best treatment with the second best, and the poorest treatment with the control group. Write a conclusion about the study
problems 2
Perform an F test on the data from Bandura and colleagues' phobia treatment study (problem 3). Write a conclusion.
problem 3
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
|