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

Descriptive or inferential?

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Classify each statement as descriptive (about the data in hand) or inferential (a conclusion about a larger group drawn from a sample).

Of the 48 matches our team played last season, we won 29.
A survey of 1,200 adults suggests that between 31% and 37% of adults in the country cycle at least once a month.
The median processing time of last month's 3,412 permit applications was 9 days.
Testing 50 batteries from a shipment of 20,000, the supplier estimates the shipment's average life at 410 hours.
In the call centre's records for Monday, 14% of calls were abandoned.