4.18 Intro to Data Science: Measures of Dispersion
In our discussion of descriptive statistics, we’ve considered the measures of central tendency—mean, median and mode. These help us categorize typical values in a group—such as the mean height of your classmates or the most frequently purchased car brand (the mode) in a given country.
When we’re talking about a group, the entire group is called the population. Sometimes a population is quite large, such as the people likely to vote in the next U.S. presidential election, which is a number in excess of 100,000,000 people. For practical reasons, the polling organizations trying to predict who will become the next president work with carefully selected small subsets of the population known as ...
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