Educational Attainment. The U.S. Census Bureau compiles census data on educational attainment of Americans. From the document Current Population Survey, we obtained the 2010 distribution of educational attainment for U.S. adults 25 years old and older. Here is that distribution.

Highest level Percentage Not HS graduate 12.9 HS graduate 31.2 Some college 16.8 Associate’s degree 9.1 Bachelor’s degree 19.5 Advanced degree 10.5 A random sample of 500 U.S. adults (25 years old and older) taken this year gave the following frequency distribution.

Highest level Frequency Not HS graduate 45 HS graduate 163 Some college 76 Associate’s degree 53 Bachelor’s degree 102 Advanced degree 61 Decide, at the 5% significance level, whether this year’s distribution of educational attainment differs from the 2010 distribution.