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What is a confounding variable?

  1. A A variable influencing both the supposed cause and the effect, creating a spurious association
  2. B A variable with missing values
  3. C An outlier
  4. D A categorical predictor
Answer

A variable influencing both the supposed cause and the effect, creating a spurious association

Randomisation controls for confounders including those you never thought of, which is why experiments are the gold standard.

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