Use the values in the following matrix to answer questions a, b, and c:
|
|
Before
Treatment
|
After
Treatment
|
Overall
|
|
Males
|
M = 20
|
M = 24
|
M = 22
|
|
Females
|
M = 22
|
M = 32
|
M = 27
|
|
Overall
|
M = 21
|
M = 28
|
|
a. Which numbers are compared to evaluate the main effect for the treatment?
b. Which numbers are compared to evaluate the main effect for gender?
c. Which numbers are compared to evaluate the interaction?