According to a 2014 research study of national student engagement in the U.S., the average college student spends 17 hours per week studying. A professor believes that students at her college study less than 17 hours per week. The professor distributes a survey to a random sample of 80 students enrolled at the college. Here are the null and alternative hypotheses for her study: : ; : . What does represent in these hypotheses? Reference: Pierre, K. How much do you study? USA Today, August 2014. http://college.usatoday.com/2014/08/18/how-much-do-you-study-apparently-17-hours-a-week-isthe-norm/ Group of answer choices Mean number of hours per week spent studying for students in the professor's sample. Mean number of hours per week spent studying for students at the college where the professor works. Mean number of hours per week spent studying for the average college student in the U.S