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Population standard deviation

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Reference no: EM132115987

a. Determine the sample size required to estimate a population mean to within 10 units given that the population standard deviation is 50. A confidence level of 90% is judged to be appropriate.

b. Repeat part (a) changing the standard deviation to 100.

c. Re-do part (a) using a 95% confidence level.

d.Repeat part (a) wherein we wish to estimate the population mean to within 20 units.

Reference no: EM132115987

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