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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Interpretation, difficulty 2 of 3

Justify your chart

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A director asks: “Do employees with more experience earn more — and is that pattern the same in every department?” In two or three sentences, say which chart you would draw from the salaries data and justify it (what goes on each axis, and how you would show department).