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Researchers are concerned about the content of potassium in a given lake. After taking 50 different water samples, they find that the average potassium content

Researchers are concerned about the content of potassium in a given lake. After taking 50 different water samples, they find that the average potassium content is 2.3 mg/liter with a standard deviation of 0.85 mg/liter. To 2 decimal places, what is the 90% confidence interval for the true mean potassium content?

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