Question 10.21

10.21 Predicting public university tuition: 2000 versus 2013.

Refer to Exercise 10.15. The data file also includes the in-state undergraduate tuition and required fees for the year 2000. Repeat parts (a) through (f) of Exercise 10.15 using these data in place of the data for the year 2008.

tuit

10.21

(a) The relationship is linear, positive, and moderate. There are no outliers; a linear model seems reasonable. (b) . (c) The plot looks random and scattered, and there is one observation with a very low residual; otherwise, the assumptions appear valid. (d) There is the same outlier; otherwise, the distribution is roughly Normal. (e) . (f) . The data show a significant linear relationship between Y2013 and Y2000 tuitions.