Compute a z statistic for each of the following, assuming the population has a mean of 100

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Compute a z statistic for each of the following, assuming the population has a mean of 100 and a standard deviation of 20:

a. A sample of 43 scores has a mean of 101.

b. A sample of 60 scores has a mean of 96.

c. A sample of 29 scores has a mean of 100.

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