The standard deviation in the pressure required to open a certain valve is known
ID: 3064310 • Letter: T
Question
The standard deviation in the pressure required to open a certain valve is known to be sigma equals 1.4 psi.=1.4 psi. Due to changes in the manufacturing process, the quality-control manager feels that the pressure variabilityvariability has beenbeen reduced. The null hypothesis was not rejected. Choose the correct answer below. A. There is sufficient evidence that the standard deviation in the pressure required to open a certain valve has not changed. B. There is not sufficient evidence that the standard deviation in the pressure required to open a certain valve has not changed. C. The standard deviation in the pressure has not changed. D. There is notis not sufficient evidence that the standa deviation in the pressure required to open a certain valve has been reducedbeen reduced. E. There is sufficient evidence that the standard deviation in the pressure required to open a certain valve has been reducedbeen reduced. F. The standard deviation in the pressure has been reduced.
Explanation / Answer
Since the null hypothesis is not rejected, there is not sufficient evidence that the standard deviation in the pressure required to open a certain valve has been reduced.
Option D is correct.
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