Statistics Quest

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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

The average department

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In an HR file, departments are coded 1 = Operations, 2 = Sales, 3 = Technology, 4 = Finance. An analyst reports that “the mean department code is 2.3, so the typical employee works close to Sales.” What is wrong?

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