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A doctor assigns people to treatment groups based on data from their medical records. Is this method of selecting treatment groups biased or unbiased?

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Answer:

  biased

Step-by-step explanation:

Any time a selection criterion is used that is other than a random draw, the selection is biased.

For a medical study, the bias may be intentional. The study may have the purpose of determining treatment efficacy based on age, gender, or previous medical history.