Calculator resources and instructions  (Page 2/4)

For ti-86

• Exit to the Home Screen. Clear it. Press 2nd LIST . Press F5 (OPS) . Press MORE . Press F1 (sum) . Press 2nd F3 (NAMES) . Find the F key with L5 and press it. Press Enter . You should see 137.1467 (to 4 decimal places). This is the SSE.
• Calculate $s$ . Press the square root symbol and enter (137.1467/2) . (You get the denominator by taking the number of data points and subtracting 2: $\text{4 - 2 = 2}$ .) Press Enter . You should see 8.2809 (to 4 decimal places).
• Multiply 8.2809 by 1.9. You should see 15.7337.
• Press L4 . Press Enter . (Use the arrow keys to scroll through L4 .)
• Compare 15.7337 to the absolute values of the numbers in L4 . If any absolute value is greater than or equal to 15.7337, then the corresponding point is an outlier.
• Absolute values of the numbers in L4 are 5.587, 1.947, 2.307, 9.8398. None of them are greater than 15.7337 so no point is an outlier.

For ti-89

• NOTE: When you do Linear Regression, a list called " resid " is created automatically. This list has the y - yhat values in it.
• Go into Flashapps and into your lists. Arrow to " resid " so you see it. Then arrow to the list name L3 . Press F3 . Press 1:names . Arrow down to STATVARS . If it is not checked, press F4 . Then arrow down to resid . Press Enter . Press ^2 . L3 will have the (y - yhat)^2 values. Press HOME and Press F1 8 to clear it. Press 2nd MATH . Press 3:List . Press 6:Sum . Press alpha L3 . Depending on how you have MODE Display Digits set, you should see approximately 137.1467. This is the SSE.
• Calculate $s$ . (You should be HOME .) Press clear . Press the square root symbol and enter 137.1467/2 ). (You get the denominator by taking the number of data points and subtracting 2: $\text{4 - 2 = 2}$ .) Press Enter . You should see 8.2809 (to 4 decimal places).
• Press the times key and enter 1.9 . Press Enter . You should see 15.7337
• Press clear . Press 2nd VAR-LINK . Arrow down to resid (It is below STAT VARS ). Press Enter . Arrow up to the list. Scroll through the list using the arrow keys.
• Compare 15.7337 to the absolute values of the numbers in the list. If any absolute value is greater than or equal to 15.7337, then the corresponding point is an outlier.
• Absolute values of the numbers in the list are approximately 5.59, 1.95, 2.31, 9.84. None of them are greater than 15.7337 so no point is an outlier.

Create a matrix to use in a test of independence on the ti-89

• Press APPS 6:Data/Matrix Editor
• Press 3:New
• Arrow over and down to 2:Matrix .
• Press Enter
• Arrow down to Folder . Either use the one that is there or arrow over and down to another folder name (don't use statvars ) and press Enter .
• Arrow down to Variable and enter a name you will remember.
• Arrow down to Row dimension and enter the number of rows you want.
• Arrow down to Column dimension and enter the number of columns you want. ( NOTE: You can change these numbers if you want for a different problem.)
• Press Enter until you see your matrix with zeroes as the entries. Fill in your matrix with the data from the table.
• Press APPS
• Press 1:Flashapps
• Press Enter
• Press F6 TESTS
• Press 8:Chi2 2-way
• Enter the name of your matrix at Observed Mat:
• Press Enter .
• You should see the screen with the test statistic and the $\text{p-value}$ .