# Variance TI-89 Calculator: Easy Steps

TI 89 > Variance TI-89

TI-89

While performing variance and standard deviation calculations by hand can be time consuming and tedious, the TI-89 can help you perform these calculations in seconds. Finding a variance on a TI-89 is as simple as entering a few numbers and hitting a couple of keys. These instructions are for the TI-89 Titanium or the regular TI-89.

## Variance TI-89: Steps

Watch the video or read the article below:

Sample problem: Find the Variance for the following data set: 2, 4, 5, 6, 8, 10, 15, 23.

Step 1: Press the HOME key. The home key is on the left hand side, third button from the top.

Step 2: Press the CATALOG key
It’s located below the APPS key in the top middle of your keypad.

Step 3: Press the down arrow key to scroll to variance(. Press the ENTER key.
A quicker way: once you get into the catalog, type the letter v (using the ALPHA key) to take you to the beginning of the v list.

Step 4: Press the 2ND key and then the open parenthesis key “(“. If you did this correctly, you should have a curly bracket. The following should now be showing on your screen:
variance({

Step 5: Enter your data set. Each number should be followed by a comma.
In our example, enter:
2, 4, 5, 6, 8, 10, 15, 23.
So you get: variance({2,4,5,6,8,10,15,23

Step 6: Press, the 2ND button, then the close parenthesis button twice. These keystrokes close the expression so you have:
variance({2,4,5,6,8,10,15,23}). (Important! Your expression must look exactly like this, with both sets of parentheses and curly parentheses.)

Step 7: Press ENTER.

Step 8: Press The diamond (♦) key and then press ENTER to get a decimal answer if the calculator gives you a radical or fractional expression (and it probably will).

That’s how to find variance TI-89! The variance for the data set {2,4,5,6,8,10,15,23} is displayed, which is 47.5536.