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What is Understanding Standard Deviation Basics about?
The standard deviation is the square root of the variance. It measures how far data points are from the mean. For a normal distribution, about 68% of the data lies within 1 standard deviation of the mean, and about 95% is within 2 standard deviations. When calculating standard deviation from a sample rather than a whole population, the formula is slightly different, using n-1 instead of n. Standard deviation is useful for measuring variability, especially for normal distributions.
- Author
- Mary Jean G. Sanguyo
- Language
- EN