7. Babcock and Marks XXXXXXXXXXreviewed survey data from 2003–2005, and obtained an average of mu = 14hor hours per week spent studying by full-time students at 4-year colleges in the United States....

7. Babcock and Marks (2010) reviewed survey data from 2003–2005, and obtained an average of mu = 14hor 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 n = 64 of today's college students and obtained an average of M = 12.5 hours . If the standard deviation for the distribution is sigma = 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 alpha = .05 .