Unhealthy Days in Cities The number of unhealthy days based on the AQI (Air Quality Index) for a random sample of metropolitan areas is shown. Construct an 91% confidence interval based on the data. Assume the variable is normally distributed. Use a graphing calculator and round the answers to at least one decimal place. 40 50 14 21 5 3 15 6 23 Send data to Excel << X olo A

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