QUESTION 1 / 20 · DESCRIBING DATAEasy
What is the median of 3, 7, 8, 12, 40?
GUESS THE CORRELATION · ROUND 1 OF 6
How strong is the pattern?
The correlation coefficient r runs from −1 (a perfect downward line) through 0 (no pattern) to +1 (a perfect upward line). Each plot is freshly generated. Set the slider to your guess.
–total error (lower is better)
YOUR GUESS0.00−10+1
What this statistics test covers, in short
Twenty multiple-choice questions at upper-secondary to first-year university level, four on each of five topics: describing data, sampling, hypothesis testing, correlation and regression, and misleading statistics. They test both how to calculate and how to interpret.
For the probability behind it, try the probability test. The test is our own and not normed.
By What's Your IQ · Reviewed 5 Oct 2026- Format
- 20 multiple-choice questions
- Level
- A-level / AP to first-year university
- Bonus
- 6-round guess-the-correlation game
- Famous warning
- Huff, How to Lie with Statistics (1954)