If a Researcher Suspects That the Strength of the Relationship

Multiple Choice

If a researcher suspects that the strength of the relationship in the population is .30 for the main effect of factor A,.10 for factor B,and .07 for the interaction effect as indexed by eta-squared,what sample size should she use per cell in a study involving three levels of factor A,five levels of factor B,and an alpha level of .05 in order to achieve a power of at least .80 for each effect?

A) 2
B) 7
C) 9
D) 13
E) 23