Minitab has an option to produce automatically 4 graphs to do residuals analysis.

residuals

Residuals analisys allows to check if the model has a good fit to the data points.

The first graph shows the cumulative of the distribution of the residuals versus the normal distribution.

The histogram shows the distribution of residuals.

The other 2 graphs show the distribution of residuals against the order and agains the value.

 

The residual shoud have a white noise behaviour it the model fits well the data.