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Q: Why you measure standard deviation?

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Units of measure do follow the standard deviation.

Standard deviation is a measure of the spread of data.

The standard deviation is a measure of the spread of data.

No. The average of the deviations, or mean deviation, will always be zero. The standard deviation is the average squared deviation which is usually non-zero.

The standard deviation is a measure of how spread out the numbers are. Three points is needed to calculate a statistically valid meaningful standard deviation.

1. Standard deviation is not a measure of variance: it is the square root of the variance.2. The answer depends on better than WHAT!

standard deviation is best measure of dispersion because all the data distributions are nearer to the normal distribution.

Standard deviation is a measure of variation from the mean of a data set. 1 standard deviation from the mean (which is usually + and - from mean) contains 68% of the data.

Standard deviation is a measure of how spread out a set of numbers are from each other. It has a variety of uses in statistics.

It is a measure of the spread of the distribution. The greater the standard deviation the more variety there is in the observations.

Yes SD is ofcourse measure of precision

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