Confident of estimating the population mean
If you want to be 95% confident of estimating the population mean to within a sampling error of (Plus or minus 6) and the standard deviation is assumed to be 18, what sample size is required?
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If you want to be 95% confident of estimating the population proportion to within a sampling error of (plus or minus 0.05 ) and there is historical evidence that the population proportion is approximately 0.37, what sample size is needed?
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