Question: . A hydraulic press is operating correctly when the standard deviation of the pressure is less than 120 pounds per square inch (psi). Suppose you

. A hydraulic press is operating correctly when the standard deviation of the pressure is less than 120 pounds per square inch (psi). Suppose you take a random sample of 15 measurements throughout the day of the psi and find the standard deviation to be 148. Suppose you want to test whether the press is operating correctly. Test the hypotheses.

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