Unformatted text preview: Data option and enter the list names with the data. This is shown in
the screen to the right. 5 7.
8. Inference for Two Sample (Paired) Means
The following instructions assume that one set of data is in L1 and the other in L2 and that the paired difference we will compute is
L2– L1. Alternatively, you can calculate the differences by hand and store the differences directly in a list, say L3.
To have the calculator compute the paired differences, L2 –L1:
1. Press K, select the Edit menu, and input your data into lists L1 and L 2.
2. Clear L3 by moving the cursor up to highlight L3 and pressing P.
3. Move the cursor back to highlight L3.
4. Type in the formula L2 – L1 by pressing this sequence of keys: F 2 c F 1. See the
screen to the right.
5. Press [.
You should now see the calculated differences stored in L3.
To ﬁnd a conﬁdence interval or conduct a hypothesis test on the paired mean difference, follow the instructions under
Confidence Intervals and Hypothesis Tests for a Mean using the differences stored in L3. Chi Squared Goodness-of-Fit Test
Note: Several versions of the TI-83/84 calculator have this test built-in. If yours does not, skip the ﬁrst
set of instructions and move on to the second.
These instructions assume that you have the list of observed counts in L1 and the list of expected counts
(generated from the probabilities in your null hypothesis) in L2.
To perform a test with the built-in function:
1. Press K and scroll to the TESTS menu.
2. Scroll down until you ﬁnd the option X 2 GOF–Test and select it. If you don’t see this, move to the next set of procedures.
3. Enter the list names with your observed and expected counts and the degrees of freedom for the test (the number of categories –1).
4. Select Calculate and press [. The results display the test statistic, x2, and the p-value, p, along with some other information.
To perform the test step by step:
1. After entering the observed and expected counts into L1 and L2, respectively, move the cursor to
highlight the list name L3. Clear this list and return the cursor to highlight the name L3.
2. With L3 highlighted, type the formula for the test statistic using the following keystrokes:
The result is shown in the screen to the right. Press [. L3 should ﬁll with the calculated values.
3. Press F G to QUIT the list edit screen.
4. Press F K to enter the LIST menu, and scroll to the MATH menu. Select option 5:sum(.
5. Type in L3 as shown in the screen to the right. Press [. This is your chi-squared test statistic.
6. Press F O to get to the DISTR menu, and select X 2 cdf(. Type in the value of the test statistic computed in step 5 (or use the ANS feature), enter a large number such as 99999, and enter the
degrees of freedom for the test, all separated by commas. Press [. This is your p-value. 6 TI_card_570774_reprint.qxp 2/12/09 3:43 PM Page 2 TI–83/84®
Inferences for Proportions (continued) Conﬁdence Intervals and Hypothesis Tests for a Mean Inference for Two Sa...
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