A class survey in a large class for firstyear college students asked, "About how many hours do you study during a typical week?" The mean response of the 463 students was ????=13.7 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation ????=7.4 hours in the population of all firstyear students at this university. Regard these students as an SRS from the population of all firstyear students at this university. Does the study give good evidence that students claim to study less than 13 hours per week on the average? State null and alternative hypotheses in terms of the mean study time in hours for the population. Group of answer choices a. ????0:????=13 hours ; ????????:????>13 hours b. ????0:????=13 hours ; ????????:????<13 hours