2.1 Facebook friends. Do people who have more Facebook friends spend more time on Facebook? In an introductory statistics class of 38 students, there were 32 users of Facebook. Each of these students was asked to report how many Facebook friends they had and the average amount of time that they spent on Facebook per week.

1. (a) Who are the cases for this study?

2. (b) What are the variables?

3. (c) Are the variables quantitative or categorical? Explain your answer.