Question

Under what circumstances is using a normal probability plot to assess the normality of a variable usually better than using a histogram, stem-and-leaf diagram, or dotplot?

Short answer

We prefer the probability plot to a histogram, stem and leaf diagram, or dot plot for assessing the normalcy of a variable in small samples.

Step-by-step solution

Given Information

Consider the probability plot.

A normal probability plot is a graphical tool for detecting significant deviations from the norm.

Explanation

It is a graphical depiction of examining the data set, which is essentially regularly distributed. The plot is typically distributed if it is straight and diagonal; otherwise, it is not. The probability plot outperforms other graphs when the sample size is limited.