Consider the following situation: Doctors question 5000 women who have had breast cancer to determine if there is a genetic factor that increases the likelihood of cancer. Each woman is asked about her family background and incidences of breast or other types of cancer among her relatives. This describes a prospective study.

Question

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This describes a retrospective study because it looks back at events that have already occurred (women who have had breast cancer) to examine their family history and incidences of cancer.

Consider the Following Situation: Doctors Question 5000 Women Who Have