Question: For a given variable, imagine we know that the population mean is 1014 and the standard deviation is 136. A mean of 1057 is obtained

For a given variable, imagine we know that the population mean is 1014 and the standard deviation is 136.

A mean of 1057 is obtained based on sampling. Calculate the z test statistic for this mean, assuming it was found using each of the following sample sizes:

a. 12

b. 39

c. 188

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