hi i need help question 7 chapter 8 please help to solve the problem thanks!

6 . Using the standard 4- step procedure , conduct a two- tailed hypothesis test with a = . 05 to evaluate the effect of the supplements . 7 . Babcock and Marks ( 2010 ) reviewed survey data from 2003 - 2005 , and obtained an average of 1 = 14 hours per week spent studying by full-time students at 4- year colleges in the United States . To determine whether this average has changed in the past 10 years , researcher selected a sample of ~ = 64 of today's college students and obtained an average of M = 12.5 hours . If the standard deviation for the distribution is ` = 4. 8 hours per week , does this sample indicate a significant change in the number of hours spent studying ? Use a two - tailed test with a =. 05