Box Plot Diagram Median. To construct a box plot use a horizontal or vertical number line and a rectangular box. First quartile Q125th Percentile.
These numbers are median upper and lower quartile minimum and maximum data value extremes. Box plots are useful as they show the skewness of a data set. Interquartile range box The interquartile range box represents the middle 50 of the data.
The second quartile Q2 sits in the middle dividing the data in half.
Data from West Magazine. Drawing a box plot from a cumulative frequency graph is straightforward as long as the median and quartiles have been found. Order the data from smallest to largest. Make sure you are happy with the following topics before continuing.
