Sample Standard Deviation of Three Values
Easystatisticsstandard deviation
What is the sample standard deviation of 2, 4, and 6?
- A1
- B1.41
- C2
- D4
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Answer: C. 2
The sample mean is 4. Use n − 1 in the sample variance: s² = [(2 − 4)² + (4 − 4)² + (6 − 4)²]/(3 − 1) = 8/2 = 4. Therefore s = √4 = 2.
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