QSR Magazine published the latest results of its annual quick serve resturant drive-thru study. One aspect of the study examined the customer drive-thru wait times for various brands. The drive-thru wait times for random samples of customers at Chick-fil-A, McDonald's, and KFC are given in the table below. Brand Customers drive-thru wait times (in seconds) Chick-fil-A 485 496 489 460 487 477 495 McDonald's 356 362 343 327 369 351 350 KFC 291 269 251 283 286 294 278 (a) Conduct a hypothesis test using a=0.05 to determine whether the mean drive-thru wait times of customers at Chick-fila-A, and KFC are the same. Assume that drive thru wait times for each of these brands reasonably follow a normal distribution. (b) Use the sample data collected in Problem 4 to construct all pairwise comparison confidence intervals to estimate the difference in the mean drive-thru wait times of customers at Chick-fil-A, McDonald's, and KFC with a simultaneous confidence level of 95%. Interpret the results.
QSR Magazine published the latest results of its annual quick serve resturant drive-thru study. One aspect of the study examined the customer drive-thru wait times for various brands. The drive-thru wait times for random samples of customers at Chick-fil-A, McDonald's, and KFC are given in the table below.
Brand Customers drive-thru wait times (in seconds)
Chick-fil-A 485 496 489 460 487 477 495
McDonald's 356 362 343 327 369 351 350
KFC 291 269 251 283 286 294 278
(a) Conduct a hypothesis test using a=0.05 to determine whether the
(b) Use the sample data collected in Problem 4 to construct all pairwise comparison confidence
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