A study reports a standard deviation of 12 mg/dL for fasting blood glucose in a sample of 144 adults. The standard error of the mean is:

• A 0.1 mg/dL
• B 1.0 mg/dL ✓
• C 1.2 mg/dL
• D 12.0 mg/dL

Explanation

Standard error of the mean equals the standard deviation divided by the square root of the sample size. Here, SE = 12 divided by the square root of 144, which is 12 divided by 12, giving 1.0 mg/dL. Option A confuses SE with SD divided by n. Option C is SD divided by 10. Option D is the SD itself, not the SE.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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