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How is the standard deviation obtained once the variance is known?
ATake one half of the variance value
BTake the reciprocal of the variance
CTake the square root of the variance
DTake the square of the variance value
Answer & Solution
Correct answer: C. Take the square root of the variance
1. The variance is an average of squared deviations, so it is measured in squared units.
2. Taking the square root returns the measure to the original units of the data.
3. The standard deviation is therefore the square root of the variance.
_Source: OpenStax Introductory Business Statistics (CC BY 4.0), Ch 2 "Descriptive Statistics", section 2.7 Measures of the Spread of the Data_
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