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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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Chapter 5
Calculating Descriptive Statistics: Measures of Dispersion
In This Chapter
◆ Calculating the range of a sample
◆ Calculating the variance and standard deviation of a sample and population
◆ Using the empirical rule and Chebyshev’s theorem to predict the distribution of data values
◆ Using measures of relative position to identify outlier data values
◆ Using Excel to calculate measures of dispersion
In Chapter 4, we calculated measures of central tendency by summarizing our data set into a single value. But in doing so, we lost information that could be useful. For the video game example, if the only information I provided you was that the mean of my sample was 6.6 hours, you would not know whether all the values ...

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