On a questionnaire designed to measure empathy, the mean score for the general population is 30.6. Random sampling of 25 scores obtained from individuals who were bullied yielded a mean of 39.5 and a standard deviation of 6.6.
Test at the .05 level of significance.
Set up the criteria for making a decision. That is, find the critical value using an alpha = .05. (Be sign specific: + ; - ; or ±)