Let the paired difference be the score before minus the score after attending the counseling sessions. The null hypothesis is that the mean of the population paired differences is equal to zero (i.e., attending the counseling sessions does not change the depression score). The alternative hypothesis is that the mean of the population paired differences is not equal to zero (i.e., attending the counseling sessions does change the depression score). The significance level is 5%. Do you reject or fail to reject the null hypothesis?

Question

Let the paired difference be the score before minus the score after attending the
counseling sessions. The null hypothesis is that the mean of the population paired
differences is equal to zero (i.e., attending the counseling sessions does not change the
depression score). The alternative hypothesis is that the mean of the population paired
differences is not equal to zero (i.e., attending the counseling sessions does change the
depression score). The significance level is 5%. Do you reject or fail to reject the null
hypothesis?

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Hypothesis Testing

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