Question

Gravetter/Wallnau/Forzano, Essentials - Chapter 13 - End of the chapter question 16

For the data in the following matrix:

   No Treatment Treatment

Male M=8    M=14    Overall M=11

Female    M=4 M=10    Overall M=7

Overall M = 6    Overall M = 12

Which two means are compared to describe the treatment main effect?

   6, 7, 8, 11 and    7, 12, 10, 11

Which two means are compared to describe the gender main effect?

8, 6, 11, 12    and 10, 7, 12, 6

Is there an interaction between gender and treatment? Explain your answer

Yes or No    gender (affects or does not affect) the mean difference due to treatment; treatment (affects or does not affect)the mean difference due to gender.

Answer 1

Answer:

Given data

No treatment treatment

Male M=8 M = 14 overall M=11

Female M=4 M = 10 overall M = 7

Overall M = 6 Overall M =12

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

The mean of the left column and the mean of the right column are compared to describe the treatment effect.

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

The mean of the top row and the mean of the bottom row are compared to describe the gender main effect.

c) Is there an interaction between gender and treatment

The treatment caused the mean to increase by 6 points between the means in the case of male and increase by 6 points between the means in the case of female