How to use the Statistics for Data Science Quiz
- 1. Answer the questionsChoose one option for each of the 15 questions.
- 2. Check your scoreSee your total and which answers were right or wrong.
- 3. Read whyEach question shows a short explanation so you learn as you go.
Topics in this quiz
These are the statistics ideas that come up again and again in data analyst and data scientist interviews. They are also the ones people most often misuse in reports.
- Centre and spread: mean vs median, variance, IQR, skew.
- Distributions: the normal curve, the 68–95–99.7 rule, z-scores, the Central Limit Theorem.
- Inference: p-values, Type I and Type II errors, confidence intervals, t-tests.
- Relationships and probability: correlation, conditional probability.
Every question is written in plain English with realistic distractors, so you have to understand the idea rather than spot a keyword.
Scoring and how to improve
Each correct answer earns one mark, with no penalty for wrong ones, so a full score is 15 / 15. Your percentage is correct ÷ 15 × 100; 11 correct is 73.3%. Questions you leave blank are counted separately so you know what to revise.
If you miss the p-value or confidence interval questions, you are in good company: both are widely misread, even in published research. The key idea is that both describe how a method behaves over many samples, not a probability about this one result. Practise with real numbers using the t-test calculator and the confidence interval calculator, then come back and try again. Nothing is recorded or sent anywhere; the quiz scores in your browser.
Frequently asked questions
Is this enough to prepare for interviews?
It covers the core ideas. Interviews also include case questions, so practise explaining each concept in your own words.
Are the questions the same each time?
Yes, the 15 questions are fixed, which makes it easy to measure your progress between attempts.
Is the Statistics for Data Science Quiz free?
Yes, the Statistics for Data Science Quiz is free. The first time you check your score, you are asked for your name and WhatsApp number once. After that, this and every other Uncodemy tool opens straight away without the form.