An individual can take either a scenic route to work or a nonscenic route. She decides that use of the nonscenic route can be justified only if it reduces the mean travel time by more than 10 minutes.
a. If µ1 is the mean for the scenic route and µ2 for the nonscenic route, what hypotheses should be tested?
b. If µ1 is the mean for the nonscenic route and µ2 for the scenic route, what hypotheses should be tested?