The class took a random sample of 30 freshman students and found a mean study time of 137 minutes with a standard deviation of 44 minutes. At = 0.01 level, is the student academic group's claim correct? Note: If you are using a Student's t-distribution for the problem, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) Part (a) State the null hypothesis. H0: 150 H0: 150 H0: < 150 H0: 150 State the alternative hypothesis. Ha: < 150 Ha: = 150 Ha: > 150 Ha: 150