Question: A manager is interested in determining if the population standard deviation has dropped below 130. Based on a sample of n = 20 items selected

A manager is interested in determining if the population standard deviation has dropped below 130. Based on a sample of n = 20 items selected randomly from the population, conduct the appropriate hypothesis test at a 0.05 significance level. The sample standard deviation is 105.

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To test H0: = 80 versus H1:

To test H0: = 20 versus H1:

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