Unexposed women comprising a contro group. at the 0.01, Ask an Expert

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A student showed 118 instances of breast cancer among 3,303 mothers who used diethylstibestro( DES), an estrogen-like substance formerly used to prevent miscarriage, compared with 80 cases in 3,330 unexposed women comprising a contro group. at the 0.01 level of significance, was the incidence of cancer greater in the DES users?

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