(4 points) Determine the sample size required to estimate a population mean to within 10 units given that the population standard deviation is 60. A confidence level of 90% is judged to be appropriate. Sample Size = Determine the sample size required to estimate a population mean to within 10 units given that the population standard deviation is 115. Use a confidence level of 90%. Sample Size = Determine the sample size required to estimate a population mean to within 10 units given that the population standard deviation is 60. Use a confidence level of 95%. Sample Size = Determine the sample size required to estimate a population mean to within 17 units given that the population standard deviation is 60. A confidence level of 90% is judged to be appropriate. Sample Size =