Statistics practice test
Try a fresh mix of five statistics practices. See how you did in each, understand your answers, and choose what you’d like to practice next.
Ready to take the test?
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What you get
- Your score in each of the five practices.
- An explanation for every answer.
- A full review saved in Progress.
Before you start
- No countdown. Time is recorded, but doesn’t affect your score.
- Choose an answer, then continue. You can go back or skip.
- Answers and explanations appear when you finish, and stay available in Progress.
Practices you may try
Each test picks five of these 8 practices, with four questions per practice. Both the mix and questions vary between attempts.
Data interpretation
Read charts and tables, then compare totals, shares and changes.
Distributions
Reason about center, spread and unusual observations.
Sampling
Separate population weights, selection bias and random variation.
Correlation detective
Interpret association and the influence of individual observations.
When averages mislead
Compare group means using the appropriate weights.
Signal or chance?
Count valid label assignments and compare equally extreme differences.
Confidence intervals
Draw repeated samples and discover which intervals capture the true mean.
The comeback illusion
Retest unusually high or low scores and separate real change from chance.