A medical researcher wants to construct a 99% confidence interval for the proportion of knee replacement surgeries
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A medical researcher wants to construct a 99% confidence interval for the proportion of knee replacement surgeries that result in complications.
a. An article in the Journal of Bone and Joint Surgery suggested that approximately 8% of such operations result in complications. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.04?
b. Estimate the sample size needed if no estimate of p is available.
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