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If you want to be 95% confident when estimating the population mean to within a sampling...

If you want to be 95% confident when estimating the population mean to within a sampling error of ± 20 and the standard deviation is assumed to be 100, what sample size is required?

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Answer #1

Refer Standard normal table/Z-table or use excel function "=NORM.S.INV((1-0.025))" to find the Z-value.

Round the value to the nearest integer.

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