How to Calculate Standard Deviation in Six Easy Steps

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Standard deviation is a measure of the extent of spread of quantifiable data. It can also be used to measure confidence in statistical conclusions. It shows how much variation or dispersion there is from the mean. In research, it is useful in presenting data from descriptive and explanatory studies. It is also important to observe data values that are spread around the mean to assess its usefulness as a typical value. In project management, standard deviation can be used to monitor project performance (ie cost and schedule variances). In healthcare, it is suitable for symmetrical distributions. This video will teach you how to manually calculate standard deviation in six easy steps: • 1. Determine the mean • 2. Determine the deviations • 3. Square them • 4. Add the squares • 5. Divide by total #s less 1 • 6. Square the variance. The result is the standard deviation.

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