Question

Asked Oct 18, 2019

If you want to be 99% confident of estimating the population mean to within a sampling error of ±25 and the standard deviation is assumed to be 125,what sample size is required?

Step 1

The provided information’s are:

Standard deviation (σ) = 125.

Sampling error (E) = ±25

Confidence level = 99%

Here, sample size is required to be calculated.

Step 2

The formula to calculate the sample size is:

Step 3

The z-value at 99% confidence level is 2.576.

T...

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