Babcock and Marks (2010) review survey data from 2003–2005, and obtained an average of hours per week spent studying by full-time students at four-year colleges in the United States. To determine...

Babcock and Marks (2010) review survey data from 2003–2005, and obtained an average of
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
of today’s college students and obtained an average of
hours. If the standard deviation for the distribution is s
hours per week, does this sample indicate a significant change in the number of hours spent studying? Use a two-tailed test with a
.