Use a 0.05 significance level and conduct a full hypothesis test using the four-step process described in the text. Be sure to state your conclusion.

A Roper poll used a sample of 100 randomly selected car owners. Within the sample, the mean time of ownership for a single car was 7.01 years with a standard deviation of 3.74 years. Test the claim by the owner of a large dealership that the mean time of ownership for all cars is less than 7.5 years.