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

Using the Power and Sample Size tool for a 2-Sample t-test


Here, we will use the power and sample size tools to find the number of samples needed to observe a difference in the means between two populations.

We will not need to open a dataset for this recipe. Using a standard deviation that has been set to 1, we will discover the number of samples required to observe a 1, 2, or 3 standard deviation difference between two population means.

How to do it…

The following steps will help us find the sample size required to detect differences of 1, 2, or 3 standard deviations between the means of two samples:

  1. Go to the Stat menu and then Power and Sample Size and then select 2 Sample t….

  2. Fill out the dialog box as shown in the following screenshot:

  3. Click on OK.

How it works…

The differences are stated in terms of the value of the standard deviation from the results shown in the following screenshot:

To observe a 1 standard deviation difference between the population means of two samples, we would need 17...