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Confidence interval for true mean

Assignment:

We wish to estimate the mean serum indirect bilirubin level of 4 day old infants. The mean for a sample of 160 infants was found to be 5.98 mg/100cc. Assume that the bilirubin levels of 4-day-old infants are approximately normally distributed with a standard deviation of 3.5mg/100cc. Construct a 95% confidence interval for the true mean bilirubin level in 4-day-old infants.

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