The owner of the car dealership is curious about the maximum discount his salespeople are willing to give to customers. In particular, two of his salespeople, Frank and Nikita, seem to have very different ideas about how much discount to allow. To test his suspicion, he selects 30 cars from the lot and asks Frank and Nikita to each say how much discount they would allow a customer. If we want to test whether the mean discount they each give is the same, what test would we use? Explain.