8.2.2.2 - Minitab Express: Confidence Interval of a Mean
Here you will learn how to use Minitab Express to construct a confidence interval for a mean. The procedure is similar to the one that you learned earlier in this lesson for constructing a confidence interval for a proportion. The following example walks through this procedure when data are in a Minitab Express work. At the bottom of this page you will find instructions for using Minitab Express with summarized data.
MinitabExpress – Confidence Interval for a Mean
To create a 95% confidence interval of mean height in Minitab Express:
- Open the data set:
- On a PC: In the menu bar select STATISTICS > One Sample > t
- On a Mac: In the menu bar select Statistics > 1-Sample Inference > t
- In this case we have our data in the Minitab Express worksheet so we will use the default Sample data in a column
- Double click the variable Height in the box on the left to insert the variable into the Sample box
- Click on the Options tab
- The default Confidence level is 95
- Click OK
This should result in the following output:
N | Mean | StDev | SE Mean | 95% CI for \(\mu\) |
---|---|---|---|---|
525 | 67.0090 | 4.4616 | 0.1947 | (66.6265, 67.3916) |
\(\mu\): mean of Height
Select your operating system below to see a step-by-step guide for this example.
What if we have summarized data and not data in a Minitab Express worksheet? Section
If you do not have a Minitab Express worksheet filled with data concerning individuals, but instead have summarized data (e.g., the values of \(s\), \(\overline{x}\), and \(n\)), you would skip step 1 above and in step 3 you would select Summarized data.