In one? year, an online travel agency reported that summer travelers booked their airline reservations an average of 70.9 days in advance. A random sample of 40 summer travelers in a later year was? selected, and the number of days travelers booked their airline reservations in advance was recorded. The data is shown below

67, 77, 93, 81, 71, 74, 74, 71, 77, 72, 87, 65, 68, 74, 87, 65, 82, 77,96, 77, 94, 60, 74, 53, 71, 89, 54, 84, 79, 69, 87, 77, 63, 63, 83, 82, 74, 58, 73, 75

a. Perform a hypothesis test using a= 0.05 to determine if the average number of days reservations are booked in advance has changed between the years.

Determine the null and alternative hypotheses.______

b. Determine the test? statistic_____

c. The critical? value(s) is(are)_____ _____

d. What conclusion should be? drawn?______

e. determine the? p-value for this test._______