Minitab plots the normal scores, probabilities or percentages versus the standardized effects. The line corresponds to a normal distribution with a standard deviation of 1. Effects with p-values less than α are labeled significant on the graph. Minitab labels this graph Normal Plot of the Standardized Effects.

Minitab plots the normal scores, probabilities or percentages versus the standardized effects. The line corresponds to a normal distribution with a standard deviation of 1. Effects with p-values less than α are labeled significant on the graph. Minitab labels this graph Half Normal Plot of the Standardized Effects.

The red line on the Pareto chart is drawn at Z, where Z is the (1 – α / 2) quantile of a standard normal distribution. Minitab labels this graph Pareto Chart of the Standardized Effects.