試題詳解

3). At the .01 significance level, is there a difference in the mean number of times men and women send a Twitter message in a day?
(A) Reject the null hypothesis and conclude the means are different.
(B) Reject the null hypothesis and conclude the means are the same.
(C) Fail to reject the null hypothesis and conclude the means are the same.
(D) Fail to reject the null hypothesis and conclude the means are different.