16.25 College tuition. Tuition for Colorado residents at the University of Colorado, Boulder, has increased as follows (use tuition at your own college if you have those data):
| Year: | 1985 | 1987 | 1989 | 1991 |
| Tuition ($): | 1332 | 1548 | 1714 | 1972 |
| Year: | 1993 | 1995 | 1997 | 1999 |
| Tuition ($): | 2122 | 2270 | 2356 | 2444 |
| Year: | 2001 | 2003 | 2005 | 2007 |
| Tuition ($): | 2614 | 3192 | 4446 | 5418 |
| Year: | 2009 | 2011 | 2013 | 2015 |
| Tuition ($): | 6446 | 7672 | 8760 | 9312 |
Use annual average CPIs from Table 16.1 to restate each year’s tuition in constant 1985 dollars. Make two line graphs on the same axes, one showing actual dollar tuition for these years and the other showing constant dollar tuition. Then explain to someone who knows no statistics what your graphs show.