The mean of pressure required to open a curtain valve is known to be mu = 7.1 ps

Question

The mean of pressure required to open a curtain valve is known to be mu = 7.1 psi. Due to changes in the manufacturing process the quality control manager feels that he average pressure has been reduced The null hypothesis was not rejected. A. There is not sufficient evidence that the mean of the pressure required to open a certain valve has not changed. B. There is sufficient evidence that the mean of the pressure required to open a certain valve has been reduced. C. The mean of pressure has been reduced D. There is not sufficient evidence that the mean of the pressure required to open a certain valve has been reduced. E. There is sufficient evidence that the mean of the pressure required to open a certain valve has not changed. F. The mean of pressure has not changed.

Explanation / Answer

Ans: Option D.

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