Statistics Quest

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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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Interpretation, difficulty 2 of 3

Gym members and sick days

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An HR department finds that employees who use the company gym took on average 3 fewer sick days last year than those who do not. The HR director wants to announce that “using the gym reduces sick leave by 3 days a year”. What is the best assessment?

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