How to Do the Calculations for Two Sample t-Tests for Independent Means Using Web Stat
1. Go to http://www.stat.sc.edu/webstat/
it will take a long time (up to a couple of minutes) to load if you are on a dial up connection. The last thing to appear will be the orange "Click here to fire it up!" button.
2. Click on the orange "Click here to fire it up!" button and a gray spread sheet will appear.
3. Type the data from Sample 1 in the "var 1" column and the data from Sample 2 in the "var 2" column like above.
4. After all the data has been entered, but your mouse on "Stat" then slide it down to "T statistic" and then over to "Two sample."
5. Click on the small down arrow as indicated by the green arrow in the diagram below and select var 1, then click on the other small down arrow in the "var2" box and select var 2.
6. Press the "Next" button and the following dialog box will appear. Make sure the "Hypothesis Test" radio button is selected (has a black dot in it). Also make sure the value in the "null mean difference:" box shows 0. Using the down arrow if necessary, make sure the "alternative" box reads "not equal."
7. Press the "Calculate" button. The solution will appear at the bottom of the page:
In the above example, the independent means t-test value is t(10) = 0.0701, p = 0.9455.
Please do not forget to do all 7 steps of your hypothesis test. See Box 10-2 on pages 215 - 216 of our textbook.