3. Variability: How Values Disperse
In This Chapter
Measuring Variability with the Range
The Concept of a Standard Deviation
Chapter 2, “How Values Cluster Together,” went into some detail about measures of central tendency: the methods you can use to determine where on a scale of values you can find the value that’s the most typical and representative of a group. Intuitively, an average value is often the most interesting statistic, certainly more interesting than a number that tells you how values fail to come together. But understanding their variation gives context to the central tendency of the values.
For example, people tend to be more ...
Get Statistical Analysis: Microsoft® Excel® 2013 now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.