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Suppose we wish to test Ho: m=80 versus Ha: m > 80, where the population standard deviation is known and equal to 20.Also, suppose that

Suppose we wish to test Ho: m=80 versus Ha: m > 80, where the population standard deviation is known and equal to 20.Also, suppose that a sample of 100 measurements randomly selected from the population has a mean equal to 85.

a) calculate the value of the test statistic z

b) by comparing z with a critical value, test Ho versus Ha at a=.05.

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