A car manufacturer claims that its vehicles average at

Reference no: EM13629459

A car manufacturer claims that its vehicles average at least 25 miles per gallon, with a population standard deviation of 4. We take a sample of n=36 cars to test fuel efficiency, and with to performance a one-sided hypothesis test of the manufacturers claim at a level of %u03B1=.025.

a. What is the critical value for the sample mean?

b. Suppose the answer to part a is 23 (it is not, but assume it is to do part b). If the true value of efficiency in the population is 22.75, what is the power of this hypothesis test?

Reference no: EM13629459

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