Some manufacturers claim that non-hybrid sedan cars have a lower mean miles-per-gallon (mpg) than hybrid ones. Suppose that consumers test 219 hybrid sedans and get a mean of 28.75 mpg with a standard deviation of 6.25 mpg. Also, 271non-hybrid sedans get a mean of 27.75mpg with a standard deviation of 6.75 mpg. Suppose that bothpopulationsare known to be normal distributed.

Conduct a hypothesis test to evaluate the manufacturers'claim.Test at a 1% level of significance.

(e) What is the test statistic? Round your answer to three decimal places Test statistic=

(f) What is thep-value? Round your answer to three decimal places. pp-value=

1. Alpha: