In a study of the effectiveness of certain exercises in weight reduction, a group of 16 persons engaged in these exercises for one month and showed the following results:
![](https://test.transtutors.com/qimg/f8ce6e39-9cf8-4b67-a1bc-67aecf2d9236.png)
Use the 0.05 level of significance to test the null hypothesis μ1 - μ2 = 0 against the alternative hypothesis μ1 - μ2> 0, and thus judge whether the exercises are effective in weight reduction.