A professor recruited students from two large sections of an introductory health course to test the validity of the "Freshman 15" theory that students gain 15 pounds their first year. Although they were volunteers, they appeared to match the rest of the freshman class in terms of demographic variables such as sex and ethnicity. The students were weighed during the first week of the semester, then again 12 weeks later. Assume a = 0.05. Complete parts a and b below. Click the icon to view the data table of freshmen initial and terminal weights. Click here to view the table of critical values. a) Use a Wilcoxon signed-rank test to test whether these students' weights changed. State your hypotheses, check conditions, and complete the test (with technology). What are the hypotheses for this test? O A. Ho: The two samples are from the same distribution. HA: One distribution is shifted in location higher or lower than the other. O B. Ho: There is no change in the median weight over the course of the semester. HA: The median weight changes over the course of the semester. O C. Ho: The median weight changes over the course of the semester. HA: There is no change in the median weight over the course of the semester.