The EPA wants to test a randomly selected sample of n water specimens and estimate the mean
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Question:
The EPA wants to test a randomly selected sample of n water specimens and estimate the mean daily rate of pollution produced by a mining operation. If the EPA wants a 99% confidence interval with a bound of error of 1 milligram per liter (mg/L), how many water specimens are required in the sample?
Assume prior knowledge indicates that pollution readings in water samples taken during a day have been approximately normally distributed with a standard deviation of 3.2 (mg/L).
n =
Related Book For
Statistics for Business and Economics
ISBN: 978-0321826237
12th edition
Authors: James T. McClave, P. George Benson, Terry T Sincich
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