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A testing laboratory wants to determine a typical range for ferritin levels. When blood tests for...

A testing laboratory wants to determine a typical range for ferritin levels. When blood tests for 75 randomly sampled people were completed, the average ferritin level was 91 ng/mL with a standard deviation of 33 ng/mL. Use these measurements to determine a 99% confidence interval for the true mean ferritin level.

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