Question: Dropping out Th e marginal nugget on page 455 describes an experiment comparing the eff ectiveness of weight loss and exercise in reducing cholesterol level

Dropping out Th e marginal nugget on page 455 describes an experiment comparing the eff ectiveness of weight loss and exercise in reducing cholesterol level and blood pressure. Explain how the 59 people who dropped out may have created bias in the results of the study.

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