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5. Construct a 99.5% confidence interval for the population mean of the average wait time, in minutes, in a Costco checkout line the afternoon of the day before Thanksgiving. n = 48, x =21.7, s= 13.8 6. The weights from a sample of nine high school football linemen are recorded below. Construct a 95% confidence interval for the population mean. Assume a normal population distribution. 265, 323, 319, 286, 250, 298, 245, 259, 296