(Answered) The epa needs to estimate the average number of iron

Economics

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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Business Economics, Economics

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