Book Image

Minitab Cookbook

By : Isaac A Newton
Book Image

Minitab Cookbook

By: Isaac A Newton

Overview of this book

Table of Contents (19 chapters)
Minitab Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Finding the critical F-statistic


The critical F-statistic is the point at which the F-statistic has a proportion in the tails of the distribution equal to the decision level of the test. Usually, these figures are referred to in tables. Such a table can be found in the Index of Applied Linear Statistical Models, Fourth Edition, by Neter, Kutner, Wasserman, and Nachtsheim.

Here we will use a significance level of 0.05, and find the critical F-statistic for 8 df in the numerator and 33 df in the denominator. These figures come from the example of Teacher Pay in the analysis of covariance in the model with the included interactions. We will derive this graphically from the probability distribution plot and from the probability distributions from the Calc menu.

How to do it…

The following steps will graphically plot the F-distribution shading the right-hand tail for an area of 0.05:

  1. Go to the Graph menu and select Probability distribution plot.

  2. Select the View probability option.

  3. Change the distribution...