Suppose that Ihno is planning to compare the men with the women in her class. Use the noncentral t distribution function in your statistical package to answer the following questions. Assume that alpha is .05 and that each test is two-tailed.

a. Use the t value you computed for the gender difference in baseline anxiety (first computer exercise of Chapter 7) as your value for delta (δ) to determine the power of that test.

b. If the population effect size for another dependent variable (DV) was only .3, how much power would Ihno have for that gender comparison?

c. If Ihno had equal-size groups of men and women, how large would each have to be to attain power = .8, given the effect size in part (b)?

d. Repeat part (b) for d = .7.