hard20 pts · first answer countscausal-thinkingbias

Coaching the worst stores

The 20 worst-performing stores last quarter got a coaching programme. This quarter, their sales improved much more than other stores. What should you be most worried about before crediting the programme?

A.Regression to the mean: stores picked for extreme low results tend to move back toward average even without any interventionB.The coaching was too expensiveC.Sales cannot be compared across quartersD.The stores were too small to measure

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Coaching the worst stores

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