Everitt reported data on a study of three treatments for anorexia in young girls. One treatment was

Question:

Everitt reported data on a study of three treatments for anorexia in young girls. One treatment was cognitive behavior therapy, a second was a control condition with no therapy, and a third was a family therapy condition. The data follow:

a. Run an analysis of variance on group differences in Gain scores.

b. Repeat the analysis, but this time use a repeated measures design where the repeated measures are Pretest and Posttest.

c. How does the answer to part

(b) relate to the answer to part (a)?

d. Plot scatterplots of the relationship between Pretest and Posttest separately for each group. What do these plots show?

e. Run a test on the null hypothesis that the Gain for the Control is 0.00. What does this analysis tell you? Are you surprised?

f. Why would significant gains in the two experimental groups not be interpretable without the control group?

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