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What is the z-score-confidence interval

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Reference no: EM131932273

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?

Reference no: EM131932273

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