the ford motor company claims that the average Miles per Gallon (MPG) rating of all cars in their product line in 24 MPG, which is the minimum required by law. You as EPA commissioner of New Jersey, have double about that figure. Therefore you select a random sample of 398 cars and measure their MPG. Then you use StatCrunch to conduct a test for the mean. StatCrunch comes up with the following output.
Would you contest the assertion made by the ford motor company or not? Use alfa=0.05, as usual. Make sure to state null and alternative hypothesis that StatCrunch is making when conduct the test.