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State the conclusion based on the results of the test The standard deviation in the...

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State the conclusion based on the results of the test The standard deviation in the pressure required to open a certain valve is known to be o 1 3 psi Due to changes in the manufacturing process the quality control manager feels that the pressure variability has increased The null hypothesis was rejected Choose the correct answer below OA The standard deviation in the pressure has not changed OB There is sufficient evidence that the standard deviation in the pressure required to open a certain valve has not changed OC There is not sufficient evidence that the standard deviation in the pressure required to open a certain valve has increased OD There is not sufficient evidence that the standard deviation in the pressure required to open a certain valve has not changed O E There is sufficient evidence that the standard deviation in the pressure required to open a certain valve has increased OF The standard deviation in the pressure has increased

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