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Problems based on power hypothesis

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Car manufacturer claims that its vehicles average at least 30 miles per gallon., with apopulation variance of 4. We take a sample of 8 cars to test fuel efficiency, and wish to perform ahypothesis test on the car manufacturers claim at a level of α=.975.22.
The critical value for the sample mean X , below which we will reject the null hypothesis of 30miles per gallon, is
:a. 27.5
b. 28.6
c. 29.1
d. 29.5
e. 30.023.

Suppose the answer to #22 is 29 (it isn't, but assume it is for the following). Also, suppose thetrue population mean for fuel efficiency is 27.5 miles per gallon. Then, the Power of thishypothesis test is:
a. .0170
b. .0523
c. .5423
d. .7801
e. .9830

Reference no: EM13799878

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