30. Adult Education. The National Center for Education Statistics reported on the percentages of adults who enrolled in personal-interest courses, by the highest education level completed.³ Of these, 8% had less than a high school diploma, 23% had a high school diploma, 32% had some college, 24% had a Bachelor's degree, and 13% had a graduate or professional degree. A survey taken of 200 randomly selected adults who enrolled in personal-interest courses showed the following numbers for the highest education level completed. Test whether the distribution of education levels has changed, using level of significance .