Reconsider the previous exercise. Determine a 95% confidence interval for comparing the population mean drive-through times between the two fast food restaurants. Also interpret what this interval says. Finally, comment on whether the confidence interval is consistent with the conclusion of your significance test in the previous exercise.

Data from previous exercise

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.

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.