Which of the following statements is true?

A. For large samples, we obtain excess kurtosis by subtracting 3 units from kurtosis.
B. Kurtosis varies from normal distribution to normal distribution.
C. A normal distribution may be leptokurtic or platykurtic.
D. It is not unusual for a sample of 100 or larger taken from a normal distribution to have excess kurtosis greater than 1.

Correct Answer: A

For large samples, we obtain excess kurtosis by subtracting 3 units from kurtosis. All the other statements are incorrect. All normal distributions have kurtosis equal to 3. A normal distribution is mesokurtic, not leptokurtic or platykurtic. For a sample of 100 or larger taken from a normal distribution, excess kurtosis greater than 1 is considered unusually large.