Twenty-nine fast-food restaurant hourly employees were surveyed to see how many hours they worked per week, on average. The following data was obtained: 23, 18, 30, 17, 29, 38, 32, 27, 35, 28, 26, 32, 21, 34, 42, 31, 26, 21, 32, 32, 36, 32, 23, 39, 43, 24, 18, 32, 25 Assuming the population standard deviation is a = 8, construct a 86% confidence interval for the mean number of hours per week that the population of fast-food restaurant employees work. 18

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