Ridesharing is a part of the growing sharing economy, which, enabled by digital tools, is transforming the Australian economy. The file TaxiUber contains waiting times (in minutes) for similar routes for regular taxis and Uber cabs in Australia.

a. At the 0.05 level of significance, is there evidence of a difference in the variance of the waiting times between the two types of taxis?

b. What assumption do you need to make in order to do (a)?

c. Evaluate the validity of the assumption in (a).

d. Based on the results of (a), which \(t\)-test for the difference between the means in Section 10.1 should you use to determine whether there is a difference in the mean waiting time between the two types of taxis?