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To calculate the standard deviation, you must first calculate the:

AThe mode
BThe range
CThe variance
DThe median
Answer & Solution
Correct answer: C. The variance
1. The two spread measures are directly related. 2. To calculate the standard deviation, we need to calculate the variance first. 3. The standard deviation is then the square root of the variance. 4. Median, mode and range are computed independently of either. _Source: OpenStax Introductory Statistics 2e (CC BY 4.0), Ch 2 'Descriptive Statistics', sections 2.1-2.7_
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