if you want to be 90% confident of estimating the population proportion to within a sampling error of 1 0.05 and there is historical evidence
if you want to be 90% confident of estimating the population proportion to within a sampling error of 1 0.05 and there is historical evidence that the population proportion is approximately 0.43, what sample size is needed? A sample size of is needed (Round up to the nearest integer )
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