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Six Sigma Black Belt Exam Prep

Category - Black Belt

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A normally distributed data should approximate the theoretical normal distribution. What is the interquartile range of a normal distribution?
  1. 1.33 standard deviations
  2. 1.67 standard deviations
  3. 1.96 standard deviations
  4. 2.67 standard deviations
Explanation
Answer: A - The interquartile range of a normal distribution is 1.33 standard deviations.

Key Takeaway: An interquartile range is also known as the midspread and it is a statistical measure of dispersion. This range is equal to the difference between the third and first quartiles and has a value of 1.33 standard deviations.
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