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Unformatted text preview: 5.6 Determining Sample Size to Estimate Required Sample Size To Estimate a Population Mean If you desire a C% confidence interval for a population mean with an accuracy specified by you, how large does the sample size need to be? We will denote the accuracy by SE, which stands for S ampling E rror. Example: Sample Size to Estimate a Population Mean Suppose we want to estimate the unknown mean height of female students at NC State with a confidence interval. We want to be 95% confident that our estimate is within .5 inch of How large does our sample size need to be? Confidence Interval for =  n s t n s t x SE x n n * 1 * 1 SE so is for interval confidence The as expressed be can for CI the SE, error sampling the of In terms Good news: we have an equation Bad news: 1. Need to know s 2. We dont know n so we dont know the degrees of freedom to find t * n1 2 * 1 * 1 gives which...
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 Spring '08
 reiland
 Business

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