In the 2009?2010 academic year, many public universities in the United States raised tuition and fees due to a decrease in state subsidies. The change in the cost of tuition, a shared dormitory room, and the most popular meal plan from the 2008?2009 academic year for a sample of 10 public universities were as follows: $1589, $593, $1223, $869, $423, $1720, $708, $1425, $922 and $308.

a) What is the mean and median change in the cost?

b) What is the five-number summary of the change in the cost?

c) What is the standard deviation of the change in the cost?

d) The middle 50% of the change in the cost is spread over what value?

e) What is the coefficient of variation of the change in cost?

f) What are the (absolute values of) the Z scores of the change in cost?

X	z-score =
308
423
593
708
869
922
1223
1425
1589
1720

g) Are the data skewed? If so, how?

x-x standard deviation