Determine the sample size required to estimate a population mean to within 8 units given that the population standard deviation is 55. A confidence level of 90% is judged to be appropriate. Sample Size = 127.7465 Determine the sample size required to estimate a population mean to within 8 units given that the population standard deviation is 90. Use a confidence level of 90%. Sample Size = 342.4813 Determine the sample size required to estimate a population mean to within 8 units given that the population standard deviation is 55. Use a confidence level of 95%. Sample Size = 181.5756

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