Random sample of 12 second-year university students enrolled in a business statistics course was drawn. at the course's completion, each student was asked how many hours he or she spent doing homework in statistics. the data are listed below. 384849394150424446483842 it is known that the population standard deviation is 9. the instructor has recommended that students devote 4 hours per week for the duration of the 12-week semester, for a total of 48 hours. test to determine whether there is evidence at the 0.07 significance level that the average student spent less than the recommended amount of time.