Here you will learn how to use Minitab 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 work. At the bottom of this page you will find instructions for using Minitab with summarized data.
Minitab® – Confidence Interval for a Mean
To create a 95% confidence interval of mean height in Minitab:
- Open the data set: fall2016stdata.csv
- In Minitab, select Stat > Basic Statistics > 1-sample t
- In this case we have our data in the Minitab worksheet so we will use the default One or more samples, each in a column
- Double click the variable Height in the box on the left to insert the variable into the box
- Select Options
- The default Confidence level is 95
- Click OK and OK
This should result in the following output:
| N | Mean | StDev | SE Mean | 95% CI for \(\mu\) |
|---|---|---|---|---|
| 525 | 67.009 | 4.462 | 0.195 | (66.627, 67.392) |
\(\mu\): mean of Height
What if we have summarized data and not data in a Minitab worksheet? Section
If you do not have a Minitab 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.