2. A researcher in exercise physiology wanted to know whether the curl-up test differs among prepubescent males and females. To test the null hypothesis, participants performed curl-up test on 7 males and 6 females and obtained the following results. (10 points) Prepubescent Male: 20, 26, 16, 18, 24, 17, 27 Prepubescent Female: 22, 18, 24, 20, 21, 26 a. Is the difference in the means significant? If so, at what level of confidence? b. Do you accept or reject the null hypothesis