Practice, difficulty 1 of 3
Find the confounder
A retail chain finds that branches whose staff received more training hours last year had higher sales per employee. Which variable is the most plausible confounder?
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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