A student doing a project for a statistics class wants to estimate the difference between the mean number of music CDs owned by male and female students. He surveys 50 male students and 45 female students about the number of music CDs they own. The mean number for the males is 110, and the mean number for females is 90.
a. What is the research question of interest for this survey?
b. What is the population parameter in this study? What is the appropriate statistical notation for this parameter?
c. What is the value of the sample estimate (statistic) in this study? What is the appropriate statistical notation for this estimate?