Question: Sample size requirements. How large a sample is needed to estimate the incidence of female breast cancer in a population with 95% confidence and a

Sample size requirements. How large a sample is needed to estimate the incidence of female breast cancer in a population with 95%

confidence and a margin of error that is no greater than 1% (0.01)?

Assume that the expected incidence proportion in the population is 3% (0.03). How large a sample would be needed if you were willing to settle for 90% confidence? What was the effect of decreasing the required level of confidence?

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