2.66 If possible with your statistical software, use the dotplot method to compare the 50-state unemployment rates in 1980 with those in 2007. Use the same scale for each dotplot, then comment on whether unemployment appears to have changed in terms of its range (highest minus lowest)

or in the general level of unemployment (perhaps a slight shift to the right or to the left) from 1980 to 2007. Data for both years are in the fi le XR02066. Source: Bureau of the Census, Statistical Abstract of the United States 2009, p. 373.