POLS 3650 Chapter Notes - Chapter 6: Interquartile Range, Squared Deviations From The Mean, Standard Deviation
29 Jan 2017
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Chapter 6: measures of variation and dispersion page #94-103: The range represents the difference between the lowest and highest scores in an ordered array. Its major limitation is similar to that of the full range in that it is based solely on the location of 2 scores. It is computed as the sum of the average squared deviations from the mean. Variances and standard deviations for binary variables: both variances and standard deviations may be computed in the special case of a measurement of attributes that are binary coded. In this process of statistical inference about population parameters, a slight adjustment is made to provide a better ( unbiased estimate) guess of these population values. In the case of the variance and standard deviations, we simply use n-1 rather than n in the denominators when computing sample estimates of these population parameters. N: when dealing with large samples (n > 50), this correction to provide unbiased estimates of.
