Finding Confidence Intervals. In Exercises 916, assume

Chapter 7, Problem 16

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Finding Confidence Intervals. In Exercises 916, assume that each sample is a simplerandom sample obtained from a population with a normal distribution. a. Comparing Waiting Lines The values listed below are waiting times (in minutes)of customers at the Jefferson Valley Bank, where customers enter a single waiting line thatfeeds three teller windows. Construct a 95% confidence interval for the population standarddeviation s.6.5 6.6 6.7 6.8 7.1 7.3 7.4 7.7 7.7 7.7b. The values listed below are waiting times (in minutes) of customers at the Bank ofProvidence, where customers may enter any one of three different lines that have formedat three teller windows. Construct a 95% confidence interval for the population standarddeviation s.4.2 5.4 5.8 6.2 6.7 7.7 7.7 8.5 9.3 10.0 c. Interpret the results found in parts (a) and (b). Do the confidence intervals suggest a differencein the variation among waiting times? Which arrangement seems better: the single-linesystem or the multiple-line system?

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