An individual can take either a scenic route to work or a nonscenic route. She decides that taking the nonscenic route can be justified only if it reduces the mean travel time by more than 21 minutes. (a) If u, is the mean travel time for the scenic route and , is the mean travel time for the nonscenic route, what hypotheses should be tested? O M1 - M2 = -21 M1 - M2 -21 OM1 - 12 = -21 M1 - M2 # -21 OM1 - My = 21 M1 - M2 21 X