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

Question 8
Multiple Choice
Question 8
Multiple Choice

## A fleet of rental cars - all the same make, model, and year - has a mean fuel efficiency of 24 miles per gallon (mpg). A random sample of 60 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 $\mu > 24 \mathrm { mpg }$ A test is made of $H _ { 0 } : \mu = 24 \text { versus } H _ { 1 } : \mu > 24$Assume that the air filter changes are not effective. Which type of error is impossible?

A) Type I
B) Type II

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