SOLUTION: A study showed 118 instances of breast cancer among 3,033 mothers who used diethylstibestrol (DES), an estrogen-like substance formerly used to prevent miscarriage, compared with 8

Question 380242: A study showed 118 instances of breast cancer among 3,033 mothers who used diethylstibestrol (DES), an estrogen-like substance formerly used to prevent miscarriage, compared with 80 cases in 3,033 unexposed women comprising a control group. At the 0.02 level of significance, was the incidence of cancer greater in the DES users?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A study showed 118 instances of breast cancer among 3,033 mothers who used diethylstibestrol (DES), an estrogen-like substance formerly used to prevent miscarriage, compared with 80 cases in 3,033 unexposed women comprising a control group. At the 0.02 level of significance, was the incidence of cancer greater in the DES users?
--------------------------------
Ho: p(yes)-p(no) = 0
Ha: p(yes)-p(no) > 0
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I ran a 2-Prop zTest with a TI-84 and got the following
p-value = 0.0030
---
Conclusion: Since the p-value is less than 2% reject Ho.
The test supports the claim that the incidence of cancer
is higher among DES users.
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Cheers,
Stan H.
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