Refer to the previous two exercises. When we allow interaction, two of the rows in the new ANOVA table are

Where Group*Repeat denotes the interaction effect.
a. Show the hypotheses, test statistic, and P-value for the test of H0: no interaction.
b. What is the implication of the result of this test? For instance, the analyses in previous exercises assumed a lack of interaction. Was it valid to do so?

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Source MS Group Repeat Error DF SS 2 15.02 7.51 0.67 0.535 9 100.67 11.19