Reconsider the data from Exercise 6.1.21 and corresponding statistics from Exercise 6.1.22 about drive-through times at two fast food restaurants. Conduct a two-sample t-test of whether the sample data provide strong evidence that the population mean drive-through times diff er between the two restaurants. Be sure to check whether the validity conditions are satisfied, state the hypotheses, report the test statistic and p-value, and summarize your conclusion.

Data from exercise 6.1.21

Students compared drive-through times at a couple of fast food restaurants in their town. They kept track of the time (in seconds) for people to go through the drive-through at Wendy’s^* and Hot ’n Now^* from the time of ordering until they exited the pick-up window during lunch time. The results are shown in the 6.1.21 histograms.