Aconsumer advocacy group is doing a large study on car rental practices. among other things, the consumer group would like to do a statistical test regarding the mean monthly mileage, , of cars rented in the u. s. this year. the consumer group has reason to believe that the mean monthly mileage of cars rented in the u. s. this year is greater than last year's mean, which was miles. the group chooses a random sample of cars rented in the u. s. this year and records their monthly mileages. suppose that the population of monthly mileage of cars rented in the u. s. this year has a standard deviation of miles and that the group performs its hypothesis test using the level of significance. based on this information, answer the questions below. carry your intermediate computations to at least four decimal places, and round your responses as indicated. (if necessary, consult a list of formulas.) what are the null and alternative hypotheses that the group should use for the test