Use the data set in Appendix B. Assume that each sample is a simple random sample obtained from a population with a normal distribution.

Table Data Set 30

Refer to Data Set 30 “Queues” in Appendix B. Construct separate 95% confidence interval estimates of σ using the two-line wait times and the single-line wait times. Do the results support the expectation that the single line has less variation? Do the wait times from both line configurations satisfy the requirements for confidence interval estimates of σ?

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CAR 1 2 3 4 5 ARRIVAL TIME 0 9 83 110 149 INTERARRIVAL TIME 94 9 74 27 39 SERVICE TIME 102 223 177 342 239 TWO LINE WAIT - ACTUAL 64 216 86 340 200 TWO LINE BAY-ACTUAL (1 = L) 1 2 1 2 1 SINGLE LINE WAIT - MODELED 64 157 142 279 253 SINGLE LINE BAY - MODELED (1 = L) 1 1 2 1 2