Please answer all parts

The average gas mileage for a certain model of car produced by an automotive manufacturer has historically been 39 mpg. Recently, the company has been working to increase the fuel efciency further. In order to determine whether there has been an increase in the average gas mileage of the vehicle model, a sample of 64 vehicles was selected. The average gas mileage in the sample was 43 mpg with a standard deviation of 16 mpg. Let a = 0.05. (a) State the null and the alternative hypotheses (in mpg). (Enter != for $ as needed.) H0: Ha: (b) Compute the test statistic. (c) Using the p-value approach, test to determine whether or not the mean gas mileage of all vehicles is signicantly more than 39 mpg. Find the p-value. (Round your answer to four decimal places.) p-value = State your conclusion. (3 Reject H0. There is insufcient evidence that the mean gas mileage of all vehicles is signicantly more than 39 mpg. '7 Reject HO' There is sufcient evidence that the mean gas mileage of all vehicles is signicantly more than 39 mpg. 5 Do not reject Ho- There is insufcient evidence that the mean gas mileage of all vehicles is significantly more than 39 mpg. (3 Do not reject Ho- There is sufcient evidence that the mean gas mileage of all vehicles is signicantly more than 39 mpg