Example 1: A recent study focused on the number of times men and women send a Twitter message in a day. The information is summarized below. 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? Answering Example: H 0 : 1 = 2 H 1 : 1 = 2 Conclusion: At the .01 significance level, there is evidence that there is a difference in the mean number of times men and women send a Twitter message in a day..