Posts tagged interquartile range
Measures of spread: range and IQR of the data set
Measures of spread: range and IQR of the data set

We looked at measures of central tendency, which we saw were various ways of representing the “middle” of a data set. But central tendency isn’t the only thing we’re interested in when it comes to data. We also want to know about spread, which is how, and by how much, our data set is spread out around its center. We also call measures of spread measures of dispersion, or scatter.

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How changes to the data change the mean, median, mode, range, and IQR
How changes to the data change the mean, median, mode, range, and IQR

In this lesson, we want to see what happens to our measures of central tendency and spread when we make changes to our data set. Specifically the changes made either by changing all the values in the set at once, or by adding a single data point to, or removing a single data point from, the data set.

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