A doctor concludes from evidence that having yearly physical exams helps people stay healthy. However, she has not considered the risk of a selection factor; thus, the doctor may ignore the possibility that

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The doctor has not considered the risk of a selection factor, which means that she has not taken into account the fact that healthy people are more likely to schedule yearly physical exams than others. Therefore, the conclusion that physical exams help people stay healthy may not be entirely accurate, as it could be due to a selection bias.

A Doctor Concludes from Evidence That Having Yearly Physical Exams