The educational level of Americans has increased throughout the 20th century. The following U.S. Census data show the level of education attained by American adults over the age of 25 years at several points in time.

a. What is the direction of the relationship between each year and level of education?
b. Use percentage differences to describe the relationship. Why don't the percentages add to 100% by year? Is there a problem in analyzing the table?
c. Do these data support the idea that Americans were more educated in 2010 than in previous years?

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Educational Level Year 1980 1990 1995 2000 2005 2010 High School Graduate or More (%) 66.5 77.6 81.7 84.1 85.2 87.1 College Graduate or More (%) 16.2 21.3 23.0 25.6 27.7 30.3