Babcock and Marks (2010) review survey data from 2003-2005, and obtained an average of u =14 hours per week spent studying by full-time students at four-year colleges in the United States. To determine whether this average has changed in recent years, a 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 o = 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 =.050