Question: 4. (30 points) Test for interaction between group therapy and pretest score. Give the full and reduced models for testing for interaction as well as

4. (30 points) Test for interaction between group therapy and pretest

4. (30 points) Test for interaction between group therapy and pretest score. Give the full and reduced models for testing for interaction as well as the hypotheses. Use the extra sums of squares from PROC REG to compute test statistic and obtain the P-value from a TEST statement. Was it reasonable to assume that the slopes are parallel

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