[All Steps] A production manager knows that historically, the amounts of impurities in bags of a chemical follow a normal distribution with standard deviation
Question: A production manager knows that historically, the amounts of impurities in bags of a chemical follow a normal distribution with standard deviation 3.8 grams. A random sample of nine bags of the chemical yielded the following amounts of impurities in grams:
18.2 13.7 15.9 17.4 21.8 16.6 12.3 18.8 16.2
Find a 90% confidence interval for the population mean weight of impurities.
Deliverable: Word Document 
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