Determine the sample size required to estimate a population mean to within 9 units given that the population standard deviation is 55. A confidence level of 90% is judged to be appropriate.
Sample Size =
Determine the sample size required to estimate a population mean to within 9 units given that the population standard deviation is 90. Use a confidence level of 90%.
Determine the sample size required to estimate a population mean to within 9 units given that the population standard deviation is 55. Use a confidence level of 95%.
Determine the sample size required to estimate a population mean to within 23 units given that the population standard deviation is 55. A confidence level of 90% is judged to be appropriate.
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