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Six Sigma Green Belt Exam Prep

Category - Six Sigma Green Belt

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A manager of an 800-room hotel wishes to study the time it takes to deliver luggage to a room. For 10 days, he collects data on delivery times which can be up to 20 per day. What measure of dispersion can he use to analyze this data?
  1. mean
  2. standard deviation
  3. median
  4. mode
Explanation
Answer: B - Standard deviation is a measure of dispersion that analyzes the spread of data around the mean.
Key Takeaway: Standard deviation is the most common measure of dispersion and provides information about the distribution of the data around the mean. When the data values are close together and the bell-shaped curve is steep, the standard deviation is expected to be small. When the data values are widely dispersed and the bell curve is relatively flat, that shows that you have a fairly large standard deviation.
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