A normal probability plot may be used to assess the assumption of normality for a set of data.

Question

Quizplus · Accepted Answer

A normal probability plot (or QQ plot) is a graphical method used to assess the normality assumption of a set of data. It plots the ordered data against expected values assuming a normal distribution. If the plotted points follow a straight, diagonal line, then the data can be considered approximately normal. If the plotted points deviate from the straight line, then the data may not be normally distributed.

A Normal Probability Plot May Be Used to Assess the Assumption