The characteristics and number of students who take an exam—especially a voluntary one such as the AP exams—are surely important. This week’s blog How do Ohio’s AP scores stack up? showed that Indiana’s AP scores were noticeably below their Midwestern peers, including the Buckeye State. Ohio’s AP scores were, on average, quite competitive with its peer states and well above Indiana’s.
One plausible theory for Indiana’s dismal AP scores is that a greater proportion of its high school students take the AP exams. This may indicate that more lower-achieving students—students who are less likely to score well on AP exams—may be taking AP exams in Indiana compared to other Midwestern states.
To probe whether this theory holds water, I calculate the percentage of junior and seniors who take the AP exams for Illinois, Indiana, Michigan, Ohio, and Pennsylvania. The charts below show the percentage of juniors and seniors who took at least one AP exam in spring 2012. The table at the end of the post reports the number of public and nonpublic school students in each class as well as the number of test-takers.
Indiana and Illinois lead, Ohio lags – Percentage of juniors and seniors taking at...