many professionals work an average of 8.5 hours per day. A CEO claims the mean work day of their firm's accountants is less than 8.5 hours.

many professionals work an average of 8.5 hours per day. A CEO claims the mean work day of their firm's accountants is less than 8.5 hours. A random sample of 25 of the firm's accountants has a mean work day of 8.2 hour iwht a standard deviation of 0.5 hours. At a significance level of 0.01, test the CEO's claim