Consider a situation in which you are interested in whether there is a 3 cm or larger difference between the means of two populations that each have a population standard deviation is 15 cm. You decide that a power of 0.080 is appropriate for your purposes. If you use a two-sample t-test with a = 0.05, what would the approximate minimum sample size be for each of the samples?

Question

Quizplus · Accepted Answer

To achieve a power of 0.80 with a significance level of 0.05 and detect a difference of 3 cm with a standard deviation of 15 cm, the approximate minimum sample size needed for each group is 400.

Consider a Situation in Which You Are Interested in Whether