An industrial/organizational psychologist wants to improve worker productivity for a client firm, but first he needs to gain a better understanding of the life of the typical white-collar professional. Fortunately, he has access to the 2008 Workplace Productivity Survey, commissioned by LexisNexis and prepared by WorldOne Research, which surveyed a sample of 650 white-collar professionals (250 legal professionals and 400 other professionals).

One of the survey questions was, "During the average workday, how many hours do you spend attending meetings?" For the subsample of legal professionals (n = 250), the mean response was M = 2.0 hours, with a sample standard deviation of s = 5.1 hours.

a. The estimated standard error is 5M = .
b. The psychologist can be 99% confident that the interval from 1.2 to includes the unknown population mean µ.
c. Develop a 95% confidence interval estimate of the mean number of work-related e-mails legal professionals receive during a typical workday.