A poll used a sample of 100

100 randomly selected car owners. Within thesample, the mean time of ownership for a single car was 6.20

6.20 years with a standard deviation of 3.62

3.62 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

6.5 years. Use a 0.05 significance level.

State the null and alternative hypotheses.

Find thez-score.