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When to use standard deviation?

The standard deviation is used in conjunction with the mean to summarise continuous data, not categorical data. In addition, the standard deviation, like the mean, is normally only appropriate when the continuous data is not significantly skewed or has outliers.

What does standard deviation tell us about data?

Standard deviation is a measure of spread in a distribution and tells us how disperse the data is in your sample (and correspondingly, your population). This helps to describe whether most of your data is close to the average or far away, something that the mean alone can't tell you.

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