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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

"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. Construct a 95% confidence interval for the difference in average service time. 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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