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 sigma equals 1.1 psi. Due to changes in the manufacturing process, the quality-control manager feels that the pressure variability has changed. The null hypothesis was not rejected. Choose the correct answer below. A. There is not sufficient evidence that the standard deviation in the pressure required to open a certain valve has not changed. B. There is sufficient evidence that the standard deviation in the pressure required to open a certain valve has not changed. C. There is sufficient evidence that the standard deviation in the pressure required to open a certain valve has changed. D. The standard deviation in the pressure has changed. E. The standard deviation in the pressure has not changed. F. There is not sufficient evidence that the standard deviation in the pressure required to open a certain valve has changed.

Step-by-step explanation:

The null hypothesis is always the opposite of the alternative hypothesis.

Due to changes in the manufacturing process, the quality-control manager feels that the pressure variability has changed. This is the alternative hypothesis. It means that the null hypothesis would assume that the pressure variability has not changed. Therefore, by not rejecting the null hypothesis, the correct option is

F. There is not sufficient evidence that the standard deviation in the pressure required to open a certain valve has changed.

gdp is the best phrase!

unless you made a typo, the answers are both a and c.

step-by-step explanation:

1.5/3 is .5 whereas 3/9 is .3333333 not proportional

22/33 is .66666 and 4/6 is also .66666 proportional

2/4 is .5 whereas 142/213 is .66666 not proportional

14/7 is 2 and 7/3.5 is also 2 proportional

you could've also checked it by doing this simple division:

if the larger fraction divides with the smaller fraction to equal 1, it is proportional. so let me show you what i mean:

when i divide 22/33 by 4/6 i get 1, so we know it is proportional, and it is the same with 14/7 and 7/3.5. now if i divide 3/9 by 1.5/3 i get .66666 so therefore we know it is not proportional.

there are many ways to do this so i wanted to show you some possible ways.