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Unformatted text preview: III. Measures of Dispersion a. Def. i. The spread/scattering of data around its center b. Types i. Range 1. The distance between the largest value and smallest value in the data set 2. Largest Value – Smallest Value ii. Variance 1. The average squared distance of the data from their mean 2. Two ways to calculated a. Population Variance: b. Sample Variance: 3. Reported in square units iii. Standard deviation 1. The average distance of the data from the mean 2. Ways to denote a. Population Standard Deviation b. Sample Standard Deviation 3. Uses the square root of the variance iv. Coefficient of Variation (CV) 1. A measure of “relative” dispersion 2. Used to compare the variability of two data sets which are measured in different unit or are of different magnitudes 3. A measure of variability free of units...
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- Winter '09
- Standard Deviation