1a) Researchers are interested in finding out the best way for people to lose weight. They obtain 30 students who are interested in losing weight; they agree to participate in the study. Participants are randomly assigned to 1 of 3 groups: a diet group, an exercise group, and a behavior modification group. After 1 month, researchers recorded the number of pounds lost by each participant. Use α = .05 to determine if there are any differences in weight loss between the 3 groups.

1b) Compute Tukey’s test to for the pairwise if necessary.

1c) Compute R2

Diet: 2 3 2 4 0 1 2 3 2 1

Exercise: 0 1 0 3 1 2 1 2 3 0

Behavior Modification: 6 3 4 5 4 7 3 5 6 7

2) A researcher wanted to examine the effects of gender (Factor A) and TV program (Factor B) on the expression of aggression. Participants either watched a violent program or an exciting non-violent program. Participants were observed during recess and the number of aggressive acts were measured. Use α = .05 to identify if there is a difference in the number of aggressive act based on TV program and gender.

Male-Violent Program: 8 7 8 6 9

Female- Violent Program: 3 4 3 5 4

Male Non Violent Program: 4 6 5 3 4

Female Non Violent Program: 0 1 2 1 2

3) Given the following data,

DV1 (X) 10 9 7 6 6 4 2

DV2 (Y) 11 10 7 5 4 4 1

1. Use a scatter plot to identify if the data suggests a positive, negative or no correlation.
2. Calculate the Pearson Correlation
3. Find the regression line that best fits this data
4. If X = 3, you would predict Y = ?

4. A researcher wanted to know which colors babies tended to prefer. Fifty babies were shown 4 different colors (red, blue, green, and yellow) randomly. Which ever color the baby looked at longer was identified as the preferred color for that baby. Below are the frequencies. Use α = .05 to test the hypothesis.

Red Blue Green Yellow

Fo 12 10 13 15

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