A fleet of rental cars- all the same make, model, and year - has a mean fuel eff

Question

A fleet of rental cars- all the same make, model, and year - has a mean fuel efficiency of 24.7 miles per gallon (mpg). A randonn sample of 54 cars are selected and the air filter of each is replaced with a new one. Let 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 > 24.7 mpg. A test is made of Ho: -24.7 versus H1: > 24.7. 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 successful. Which of the three conclusions is best if Ho is rejected? A) B) 111 C) ii

Explanation / Answer

Ho: With same model mean fuel efficiency is 24.7 miles per gallon.

H1: With new air filter mean fuel efficiency is more than 24.7 miles per gallon.

If Ho is rejected best conclusion is

A) i) The air filter changes are effective.

Reason:- mean fuel efficiency is increased from the earlier one.

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