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ducted at 39 medical centers to study the benefits and risks of hormone replacement therapy (HRT)....

ducted at 39 medical centers to study the benefits and risks of hormone replacement therapy (HRT). Half of the women took placebos and half used a widely pre-scribed type of hormone replacement therapy. There were 40 cases of dementia in the hormone group and 21 in the placebo group.19
Is there sufficient evidence to
indicate that the risk of dementia is higher for patients using the HRT? Test at the 1% level of significance.

Math   Statistics-And-Probability   
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