The Anorexia data file on the text CD shows weight change for 72 anorexic teenage girls who were randomly assigned to one of three psychological treatments. Use software to analyze these data. (The change scores are given in the file for the control and cognitive therapy groups. You can create the change scores for the family therapy group.)
a. Construct box plots for the three groups. Use these and sample summary means and standard deviations to describe the three samples.
b. For the one-way ANOVA comparing the three mean weight changes, report the test statistic and P-value. Explain how to interpret.
c. State and check the assumptions for the test in part b.