Question: 8.31 For a given variable, imagine we know that the population mean is 1014 and the standard deviation is 136. A sample mean of 1057

8.31 For a given variable, imagine we know that the population mean is 1014 and the standard deviation is 136. A sample mean of 1057 is obtained. Calculate the z statistic for this mean, using each of the following sample sizes:

a. 12

b. 39

c. 188

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