How to calculate standard deviation

Calculation steps of sample standard deviation:

Step 1. (Subtract from each sample data average of all data in the sample).

Step 2. Add the squares of the values ​​obtained in step 1.

Step 3. Divide the result of step 2 by (n - 1) ("n" refers to the number of samples).

Step 4. The square root of the value obtained from step 3 is the standard deviation of sampling.

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Calculation steps of overall standard deviation:

Step 1, (Each Sample data minus the average of all data in the population).

Step 2. Add the squares of the values ​​obtained in step 1.

Step 3. Divide the result of step 2 by n (“n” refers to the overall number).

Step 4. The square root of the value obtained from step 3 is the overall standard deviation.

Standard deviation is also called standard deviation, or experimental standard deviation. Standard deviation (Standard Deviation) describes the average distance (deviation from the mean) of each number. It is the average sum of the squared deviations. The square root of , represented by σ. The arithmetic square root of the standard deviation. The standard deviation reflects the dispersion of a data set. The smaller the standard deviation, the less divergent the values ​​are, and vice versa. The size of the standard deviation can be measured by the ratio of the standard deviation to the mean.

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