F-Tests

To perform an F-Test on the calculator there is one thing you must remember. The data with the largest variance goes into list 1 and the other into list 2.

No matter what order the text puts the data in, on the calculator the data set that has the largest variance is called sample 1!
This only applies to F-Test on the calculator.

The Hypothesis for the F-Test are Ho: s1 = s2 Ha: s1 s2 , and we will reject Ho if our p-value < .10

We will once again use the STAT TESTS Menu.
Press:

Arrow Left to TESTS and Arrow up to D: 2-SampFTest...

Press:

Once again we choose Data as we will enter the statistics ourselves.

Note the order. The calculator always puts List 2 on top(it must be the sample with the largest variance)
The test line still must match Ha.

After you adjust all fields for your problem Arrow Down to Calculate and Press:

As can be seen from the screen, the p-value is .007 which is less than .10 therefore we reject Ho.

At the _ = .10 level the two variances are not equal.

Example 2
For this problem we begin by entering the data into the calculator.

I entered the Sample1 data into List 1 and Sample2 data into List 2.

After you have entered all the data

Press:

Arrow Left to TESTS and Arrow up to D: 2-SampFTest...

Press:

I choose Data so the calculator will read from the lists.

This line must match your Ha.

After you change all fields for your problem Arrow Down to Calculate and Press:

As can be seen from the screen, the p-value is .951 which is not less than .01 therefore we do not reject Ho.