On-campus students may get more sleep than off-campus students because they don't have to get up earlier to commute; or perhaps they get less sleep because of latenight noise in the dormitories; or perhaps they get about the same amount of sleep as off-campus students.

a. Use software to access the student survey data, and report the mean hours of sleep for on-campus and for offcampus students.

b. Which sample mean is higher?

c. Does the difference appear to be major or minor?

d. If we want to use mean hours slept by samples of on- and off-campus students to decide if there is evidence that all on-campus students sleep longer than all off-campus students, are we mainly concerned with data production, displaying and summarizing data, probability, or statistical inference?