Which is the proper way to state the null hypothesis for a main effect?
A) H0: an interaction effect does not exist
B) H1: not all µs are equal
C) H1: an interaction effect exists
D) H0: all µs are equal

Question

Quizplus · Accepted Answer

The proper way to state the null hypothesis for a main effect is that there is no significant difference between the means of the groups being compared. This is represented by H0: all µs are equal, which is choice D. Choices A and C refer to interaction effects, which are not relevant to the null hypothesis for a main effect. Choice B refers to the alternative hypothesis, which is not what is being asked for in this question.

Which Is the Proper Way to State the Null Hypothesis