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Mean difference that is the main effect for treatment,gender

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Matrix =
No treatment Treatment
Male M = 5 M = 3 Overall M = 4
Female M = 9 M = 13 Overall M = 11
overall M = 7 overall M = 8

a. How to describe the mean difference that is the main effect for the treatment?
b. How to describe the mean difference that is the main effect for gender?
c. Is there an interaction between gender and treatment? Explain your answer.

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This solution is comprised of an explanation of how to evaluate treatment effects in the context of statistics and matrices.

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(a) Since the means for the two treatments (7 and 8) are different, it appears that there is ...

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