The EPA needs to estimate the average number of iron particles in ppm from our drinking water. They are required to make a 99% confidence interval that has a margin of error no more than 0.37. From nearby water sources they have reason to believe the standard deviation is 2.3.
What is the z-score they will need for their confidence interval?
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Confidence Level = 99% α = 1 − 0 . 9 9 = 0 . 0 1 2 α = 2 0 . 0 1 ... View the full answer