Note: The critical F value for degrees of freedom (1,76)is 3.96.
The test for the "main effect" of Variable B focuses on the difference between the _________.
A)marginal means 10.2 and 6.5
B)marginal means 9.8 and 6.9
C)cell means 12.1 and 7.5
D)cell means 12.1 and 8.3

Question

Note: The critical F value for degrees of freedom (1,76)is 3.96.
The test for the "main effect" of Variable B focuses on the difference between the _________.
A)marginal means 10.2 and 6.5 
B)marginal means 9.8 and 6.9 
C)cell means 12.1 and 7.5 
D)cell means 12.1 and 8.3

Quizplus · Accepted Answer

The main effect of Variable B focuses on the difference between the marginal means of 9.8 and 6.9, which represent the overall means of Variable B at both levels of Variable A. The F value for this test is 12.69, which exceeds the critical F value of 3.96, indicating a significant main effect of Variable B. The cell means are not used to test for the main effect, but rather for examining interactions between the two variables.

Note: the Critical F Value for Degrees of Freedom (1,76)is