This
tutorial assumes you have already downloaded and installed the academic version
of Statlets. If not, please press the [Links] button, go to Statlets web
site and download and install it on your computer.
How to Do the
Calculations for a Confidence Interval Using Statlets
1. When you start Statlets, the following spreadsheet should appear. If not, click on the "File" pull down window and select "New."
2. Click on "Col_1" and the entire row should become shaded.
3. Type a new variable name, let's use "Weight" then press return: Then enter the following numbers, pressing return after each one:
2973
3193
2990
3077
3092
2996
2954
3006
3106
3077
4. Click on the "Analyze" menu, slide down to "One Sample" and slip over to "One Variable Analysis."
the following dialog box will appear:
5. Click on "Weight" then click on arrowhead that is pointing away from Weight.
6. Click on the "t-test" tab and the following should appear.
The 95%CI is (2992.93, 3099.87).
7. If you want another confidence inteval, say the 99%CI, click on the [Options] button.
Change the "Alpha:" from 5.0 to 1.0
Then press the [OK] button.
8. Now we want to save this output by either printing it or doing a screen capture.
To print, click on the "File" pull-down menu and select "Print." The following dialog box will appear.
Make sure that the radio button for "Current tab only" is selected as shown above, then press the "OK" button.
Instead of
printing, or in addition to it, you can do a screen capture and then paste the screen
image into a document. To do a screen capture, hold down the "Alt"
key as you press the "Print Screen" key. This puts the active window
(your results) in your computer's clipboard. Now, without closing Statlet, open
your word processor (Word, Works, WordPerfect, etc) and do a paste (either
Edit/Paste or hold down the "Ctrl" key as you press the "v"
key). All the images in this tutorial were done using this method of screen
capturing. Note: if you press the "Print Screen" key without pressing
the "Alt" button, you will capture the entire screen and not just the
active window (which is all we need to capture) for our purposes.