**Total amplitude**: Defined as the difference between the largest and smallest observations

For example, the amplitude between 8 12 14 16 18 is 10.

**Standard Deviation (SD)**: DP is the square root of variance. It is a measure of variability that takes into account all the information contained in the sample.

An example like the following illustrates well the application of the standard deviation measure.

The average age of the sample was 15.00 years, with a standard deviation of 1.05 years, which indicates the majority of respondents between 14 and 16 years.

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For example, in the sample (10 12 14 16 18), the standard deviation will be

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