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# Understanding standard deviation and z score.

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- Explain thoroughly, the concept of standard deviation.
- How does range affect standard deviation?
- What is a z-score, and how do z-scores relate to the mean of a set of data?
- Generally speaking, how is the percentage of data which lies in between two z-scores calculated?

##### Solution Summary

Standard deviation and z score are discussed.

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The range is the simplest measure of spread or dispersion: It is equal to the difference between the largest and the smallest values. The range can be a useful measure of spread because it is so easily understood. However, it is very sensitive to extreme scores since it is based on only two values.

The variance is a measure of how spread out a distribution is. It is computed as the average squared deviation of each number from its mean. The ...

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