7.88 Average service time. Another benchmark that was measured in the QSRMagazine.com drive- thru study, described in Exercise 7.49 (page 430), was the service time. A summary of the results (in seconds) for two of the chains is shown below: Chain Taco Bell McDonald's n 165 165 F 240.38 289.05 a. Is there a difference in the average service time between these two chains? Test the null hypothesis that the chains' average service time is the same. Use a significance level of 0.05. b. Construct a 95% confidence interval for the difference in average service time. 36.3 40.7 c. Lex plans to go to Taco Bell and Sam to McDonald's. Is the interval in part (b) likely to contain the difference in their service times they encounter? Explain your answer.

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7.88 Average service time. Another benchmark that was measured in the QSRMagazine.com drive-
thru study, described in Exercise 7.49 (page 430), was the service time.45 A summary of the results
(in seconds) for two of the chains is shown below:
Chain
Taco Bell
McDonald's
n
165
165
2
240.38
289.05
36.3
40.7
a. Is there a difference in the average service time between these two chains? Test the null
hypothesis that the chains' average service time is the same. Use a significance level of 0.05.
b. Construct a 95% confidence interval for the difference in average service time.
c. Lex plans to go to Taco Bell and Sam to McDonald's. Is the interval in part (b) likely to contain the
difference in their service times they encounter? Explain your answer.
Transcribed Image Text:7.88 Average service time. Another benchmark that was measured in the QSRMagazine.com drive- thru study, described in Exercise 7.49 (page 430), was the service time.45 A summary of the results (in seconds) for two of the chains is shown below: Chain Taco Bell McDonald's n 165 165 2 240.38 289.05 36.3 40.7 a. Is there a difference in the average service time between these two chains? Test the null hypothesis that the chains' average service time is the same. Use a significance level of 0.05. b. Construct a 95% confidence interval for the difference in average service time. c. Lex plans to go to Taco Bell and Sam to McDonald's. Is the interval in part (b) likely to contain the difference in their service times they encounter? Explain your answer.
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