Question: A research study finds that gender (X) predicts cholesterol level (Y). A third variable diet (Z) is then introduced. The researchers find that diet (Z)

A research study finds that gender (X) predicts cholesterol level (Y). A third variable diet (Z) is then introduced. The researchers find that diet (Z) is a better predictor of cholesterol level (Y) and that the relationship between gender (X) and cholesterol level (Y) was spurious

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