[Solution Library] An air pollution index (from 1 to 25, with 25 being the most serious pollution) takes into account the amount of carbon monoxide in the air.
Question: An air pollution index (from 1 to 25, with 25 being the most serious pollution) takes into account the amount of carbon monoxide in the air. A random sample of 30 readings taken one hour before sunset had a sample mean index reading of 10.6 with a sample standard deviation of 3.1. Find a 95% confidence interval for the population mean index rating.
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Z-test for One Population Mean - MathCracker.com