DS StatisticsLesson 14Free preview
Stat Standard Deviation
This lesson is part of Data Science · All levels
Summary
Standard deviations measure how far the data values are spread from the mean. Small values mean data is accumulated near the mean, whereas large values indicate a wide distribution. Technically, the standard deviation is the square root of the variance and is expressed with σ for the population.
Key points
- Standard deviation = square root of variance, measuring the distribution of mean.
- Population symbols: σ (sigma); sample: s.
- Small value = uniform data; large value = variable data.
- The standard unit of deviation is the same as the original data unit.
- It's useful to compare the consistency of two sets of data with the same mean.
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