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# A Fleet of Rental Cars - All the Same Make $\mu$

Question 15
Multiple Choice
Question 15
Multiple Choice

## A fleet of rental cars - all the same make, model, and year - has a mean fuel efficiency of 27 miles per gallon (mpg). A random sample of 54 cars are selected and the air filter of each is replaced with a new one. Let $\mu$ be the population mean fuel efficiency score that would occur if every car's air filter were replaced. The air filter change is deemed effective if $\mu > 27 \mathrm { mpg }$ A test is made of $H _ { 0 } : \mu = 27$ versus $H _ { 1 } : \mu > 27$Consider these possible conclusions:i). The air filter changes are effective.ii). The air filter changes are not effective.iii). The air filter changes might not be effective.Which of the three conclusions is best if $H _ { 0 }$ is not rejected?

A) ii
B) i
C) iii

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