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 critical t-statistics using the probability distribution plot


The critical t-statistic can be found from either the Calc menu tools under Probability Distributions, or from the Graph menu and Probability Distribution Plot…. Here, we will find the critical t-statistic using the graphical tools used in probability distribution plots. In this recipe, we will find the critical t-statistic with 14 degrees of freedom for a two-sided test.

How to do it…

The following steps will show us how we can use the probability distribution plot tools to find the critical t-statistic:

  1. Go to the Graph menu and select Probability Distribution Plot….

  2. Choose the View Probability chart.

  3. From the Distribution: dropdown, select t and under Degrees of freedom:, enter 14.

  4. Select the tab for Shaded Area. Ensure that the option for Define Shaded Area By is already Probability.

  5. For a two-sided test, select Both Tails. Leave the Probability at 0.05.

  6. Click on OK.

How it works…

Probability distribution plots allow us to easily...