The average hemoglobin reading for a sample of 30 teachers was 16 grams per 100 milliliters, with a sample standard deviation of 2 grams. Find the 95% confidence interval of the true mean.
Solution:
The 95% confidence interval of the true mean is:
16 - 1.96*(2/sqrt(30)) < u < 16 + 1.96*(2/sqrt(30))
15.28 < u < 16.73 (grams per 100 milliliters)
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