Things to remember:
- The range is the maximum minus the minimum value.
- You can't just take the average distance to the mean: negatives and positives cancel each other out.
- Converting the negatives to positives and then taking the average is the MAD: mean absolute deviation--not used frequently.
- Squaring the distances to the mean then taking the average provides the variance. An important measure used often, just not easy to interpret.
- Taking the square root of the variance provides the standard deviation.
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