Most experts recommend college students get at least 8 hours of sleep per night. You collect a random sample of 112 students at your college and ask how many hours of sleep they got last night. The sample mean amount of sleep last night was 7.6 hours, with a sample standard deviation of 2.1 hours. The sample distribution of hours of sleep was slightly skewed right. Does this provide evidence that students at your college are getting less than the recommended amount of sleep per night?

What is the null hypothesis?

(a) The mean amount of sleep per night among all college students in the U.S. is equal to 8 hours.

(b) The mean amount of sleep per night among all students at your college is equal to 8 hours.

(c) The mean amount of sleep per night among the 112 students surveyed is equal to 8 hours.

or (d) The mean amount of sleep per night among all students at your college is 7.6 hours.