Question bank · Statistics

Statistics question bank

Over 150 questions on descriptive statistics, probability, distributions, sampling, hypothesis testing, regression and the business traps interviewers love. Every answer comes with the reasoning, not just the number. Practise by topic, then take a timed mixed exam.

Your win todayScore 80% or better on a 20-question mixed set, and be able to explain every miss in one sentence without looking at the answer. That is the level an analyst interview expects.

1 · Pick topics

2 · Choose a set

Questions Practice — instant feedback Exam — timed, marked at the end

How to use this bank

Concept first. Do one topic at a time in practice mode. If an explanation surprises you, stop and reread it before the next question.
Say the definition out loud. Interviews test whether you can explain a p-value, a confidence interval and a Type II error to a non-statistician. Whisper the answer before clicking.
Then mix. Select all topics and do 20 questions. Real interviews do not announce the topic.
Finish with an exam set. 20 questions, 20 minutes, no feedback until the end. Review every miss and note the topic.

The four answers that lose marks

"The p-value is the probability the null is true." It is the probability of data this extreme given the null.
"The 95% CI has a 95% chance of containing the mean." The interval either contains it or not; the procedure works 95% of the time.
"Correlation proves causation." It does not; look for confounding and study design.
"We accept the null." Say fail to reject the null.

Primary sources

Read OpenStax Introductory Business Statistics 2e for definitions and worked examples — free, peer-reviewed, and close to the language of business interviews. For intuition on regression, p-values and the CLT, watch StatQuest with Josh Starmer. For VIF and regression diagnostics, use Penn State STAT 462.

💬 Ask your teacher: "explain the Bayes question again", "quiz me on p-values for 10 minutes", "why is the standard error not the standard deviation?", or "give me 15 more regression interpretation questions".