Between Wendy's and Mcdonald's which drive through window is faster?To answer this question a random sample of service times for each restaurant was measured.At Wendy's, 213 cars were timed and they were served in an average time of 149.85 seconds with a standard deviation of 21.82; At Mcdonalds 202 cars were timed and were served in an average time of 154.43 seconds with a standard deviation of 23.64.Can we infer from this study that there are differences in service times between the two chains?

Use alpha =.05