What is an interval plot?

An interval plot is a graphical summary of the distribution of a sample that shows the sample's central tendency and variability. The default interval plot displays a mean symbol with a 95% confidence interval bar. Interval plots are especially useful for comparing groups.

Example of an interval plot

This plot compares the durability of four different carpet types. While the means seem to be different, the differences are probably not significant because all the interval bars easily overlap.

Example of intervals that do not overlap

In this example, the difference between means probably is significant because the interval bars do not overlap.

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