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A researcher has collected the blood samples of 30 individuals and found that the mean hemoglobin concentration for the sample of individuals is 13.9 grams

A researcher has collected the blood samples of 30 individuals and found that the mean hemoglobin concentration for the sample of individuals is 13.9 grams per deciliter and the standard deviation is 1.43 grams per deciliter. Calculate and interpret a 99% confidence interval for the mean hemoglobin concentration for the population. Please show me how to solve this problem.

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