Question: A social worker conducted an 8-week assertiveness training workshop. Afterward, the 14 clients took the Door Manifest Assertiveness Test, which has a national mean of 24.0. Use the data that follow to construct a 95 percent confidence interval about the sample mean. Write an interpretation about the effectiveness of the workshop.
24 25 31 25 33 29 21
22 23 32 27 29 30 27