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:

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.

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Weight Weight Weight Weight before afterbeforeafter 166 154 181 164 201 175 233 142 198 173 172 172 155 185 167 211 180 214 182 194 160 182 179 192 161 182 181 245 146