A poll used a sample of 100 randomly selected car owners. Within the? sample, the mean time of ownership for a single car was 6.09 years with a standard deviation of 3.37 years. Test the claim by the owner of a large dealership that the mean time of ownership for all cars is less than 6.5 years. Use a 0.05 significance level

B.

H0?: μ=6.5 years

Ha?: μ<6.5 years

Explanation:

Ha? : the owner of a large dealership that the mean time of ownership for all cars is less than 6.5 years

H0: the owner of a large dealership that the mean time of ownership for all cars is equal to 6.5 years

Find the? z-score.

z=___________________ ?(Round to two decimal places as? needed.)