Use the Following Information for Questions

Short Answer

Use the following information for questions:
Managerial training programs often teach supervisory skills. Are these training programs effective? A company psychologist administers a test to each of 10 supervisors before and after attending such a training program. Higher scores indicate increased supervisory skills. The results are used to estimate the mean improvement in supervisory skills.
-Suppose the mean improvement in supervisory skills was 3 point and the standard deviation of the sampled differences was 2 points. Give the standard error of the sample mean difference.