STAT 3001-which two means are compared to describe the treatment main effect

Question
For the data in the following matrix:

No trx Treatment

Male M=5 M = 3 Overall M = 4

Female M = 9 M =13 Overall M = 11

Overall M = 7 Overall M = 8

a) which two means are compared to describe the treatment main effect?

b.) which two means are compared to describe the gender main effect?

c. ) Is there an interaction between gender and treatment? Please explain answer.

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