For the data in the following 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: Describe the mean difference that is the main effect for the treatment.
B: Describe the mean difference that is the main effect for gender.
C: Is there an interaction between gender and treatment? Explain the answer