STATISTICAL TECHNIQUES AND TOOLS
MEASURES OF VARIABILITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Variance is the average of the squared distance of each datum from the mean.
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True
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False
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -Variance is the average squared deviations from the mean, while standard deviation is the square root of this number. Both measures reflect variability in a distribution, but their units differ: Standard deviation is expressed in the same units as the original values (e.g., minutes or meters).
Detailed explanation-2: -Definition. The variance provides a measure of spread or dispersion of a population. It is computed as the average of the squared deviations of the observations from their mean, hence its alternative name mean square error.
Detailed explanation-3: -Variance. Mean of the squares of the deviations from mean is called the variance.
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