Statistics Quest

Practice

Practise until it sticks

Choose a topic, a skill or a difficulty. Calculation exercises have new versions with fresh numbers once you have solved them, so you can practise the method rather than memorise an answer.

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Practice, difficulty 1 of 3

Primary or secondary?

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From the point of view of the analyst described, classify each dataset as primary or secondary data.

A restaurant owner hands out her own feedback cards to diners for a month.
A consultant uses national labour-force statistics published by the statistics office.
A product team runs an A/B test on its own app.
A researcher studies traffic accidents using police incident records.
A marketing analyst uses the company's past transaction logs to study basket sizes.