Free multiple-choice descriptive statistics exam for undergraduate and graduate students in psychology and the health sciences: central tendency, variability, position and transformed scores, distributions and skewness, correlation and simple regression. Every attempt draws questions at random; your score shows on screen and the full correction, explained question by question, arrives in your academic inbox.
Worked example: in a salary distribution with mean 32,400 and median 24,100, the center is better summarized by the median. The gap reveals positive skew: a few very high values drag the mean toward the right tail, while the median resists because it depends only on the order of the data.
Is it free? Yes, completely: no sign-up; only an email at the end so we can send the correction. Do you store my answers? No: they travel once to the server for grading, and only an anonymous record of the attempt remains (subject, score and email domain).
Test yourself on descriptives: central tendency, variability, z scores, skewness, correlation and regression. Explained correction in your academic inbox.