The "House of Blues" in Boston is planning its budget for next year. In estimating the secui man-hours needed for concerts, the average length of concerts is required. Using a randor sample of n = 36 previous concerts, the sample mean duration is = 110 minutes, while th population standard deviation is o = 20 minutes. (a) What is the population, the sample, the unit and the variable measured? (b) Using Minitab, determine the 95% confidence interval for the true mean duration u of concerts using the sample data.

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