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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.
-What can be concluded by failing to reject the null hypothesis?
A)that the null hypothesis is correct,therefore the alternative hypothesis should be rejected
B)that the alternative hypothesis is correct,therefore the null hypothesis should be rejected
C)that the function of the alternative hypothesis is incorrect
D)that the test procedure is not strong enough to reject the null hypothesis

Question

Quizplus · Accepted Answer

Failing to reject the null hypothesis suggests that there is not enough evidence to support the alternative hypothesis, not that the null hypothesis is necessarily true. It indicates the test might not be powerful enough to detect a difference if one exists.

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