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...

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.