### Interpreting Box-and-Whisker Plots

If you were asked to evaluate a box plot to find the median, quartiles, extremes and outliers, would you know how? What does it mean if the ‘box’ in a box plot is unusually long or short? Does a long ‘whisker’ on one or both sides mean something important?Review the lesson below and we’ll return to answer these questions at the end.Box-and-whisker plots (or “box plots”) are commonly used to compare a single value or range of values for easier, more effective decision-making. Box and whisker plots are very effective and easy to read, and can summarize data from multiple sources and display the results in a single graph.

Grades 6 through 7 Material from CK-12

#### Why Use This Content?

See when students have begun their work. Or not.

#### Standards

##### 6.SP.A.2

Understand that a set of data collected to answer a statistical question has a distribution which can be described by its center, spread, and overall shape.

##### 6.SP.B.4

Display numerical data in plots on a number line, including dot plots, histograms, and box plots.

##### 7.SP.B.4

Use measures of center and measures of variability for numerical data from random samples to draw informal comparative inferences about two populations.

##### 7.SP.B.3

Informally assess the degree of visual overlap of two numerical data distributions with similar variabilities, measuring the difference between the centers by expressing it as a multiple of a measure of variability.