Box And Whisker Plot Skewness. In this sample n100 the outer points green mark the extremes and with the median suggest left skewness. The first second and third quartiles of the data values are determined.
The box-and-whisker plot also known simply as the box plot is useful in visualizing skewness or lack thereof in data. It shows as a graphic summary the median location spread dispersion skewness and outliers in the data. The term box plot refers to an outlier box plot.
Here are the basic parts of a box plot.
In this sample n100 the outer points green mark the extremes and with the median suggest left skewness. If the whisker to the right of the box is longer than the one to the left there is more extreme values towards the positive end and so the distribution is positively skewed. The distance between Q3 and Q1 is known as the interquartile range IQR and plays a major part in how long the whiskers extending from the box are. It is also utilised for descriptive data interpretation.
