Births to unwed mothers. Here are data on births to unwed mothers as a percentage of births in the United States, from the Statistical Abstract.

These data show a clear increasing trend over time. Make two line graphs of these data: one designed to show only a gradual increase over time, and a second designed to show a shockingly steep increase.

Year: 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005

% unwed mothers: 5.3 7.7 10.7 14.2 18.4 22.0 28.0 32.2 33.2 36.8 212 CHAPTER 10 Graphs, Good and Bad Figure 10.16 A newspaper’s graph of the value of the British pound, for Exercise 10.14.