A Fleet of Rental Cars - All the Same Make $23.4$

Multiple Choice

A fleet of rental cars - all the same make, model, and year - has a mean fuel efficiency of $23.4$ miles per gallon (mpg) . A random sample of 56 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 $\mu > 23.4$ mpg. A test is made of $H _ { 0 } : \mu = 23.4$ versus $H _ { 1 } : \mu > 23.4$ .
Assume that the air filter changes are not effective. Which type of error is impossible?

A) Type I
B) Type II