What sample size should be used

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A statistics practitioner would like to estimate a population mean to within 40 units with 99% confidence given that the population standard deviation is 160.

A. What sample size should be used?

B. Redo Part a changing the standard deviation to 50

c. Redo Part a using a 95% confidence level.

d. Redo Part a wherein we wish to estimate the population mean within 8 units.

Reference no: EM131860370

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