How to Calculate Standard Deviation on the TI–84 . Calculator

This wikiHow teaches you how to calculate the standard deviation of a data set on the TI-84 graphing calculator. Standard deviation is used to determine how scattered the data set is compared to the mean. After entering the data, you can use the 1-var-stats option to calculate a variety of statistics, including the mean, sum, sample standard deviation, and standard deviation. of the whole in one step.

Steps

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Press the STAT button on the calculator. This button is in the third column.

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Select the Edit menu and press ↵ Enter . This option is at the top of the menu. Columns (lists) from L1 to L6 will appear.

Note: The TI-84 calculator allows up to 6 different data set lists to be entered.

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Delete existing data in the list. If previous data is still in the columns, apply these steps to clear it before continuing:

Use the arrow buttons to go to list L1 (first column).
Press ⎚ Clear .
Press ↵ Enter .
Repeat with the other data list.

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Enter new data in column L1. Press ↵ Enter after each value.

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Press the STAT button to return to the menu.

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Press the right arrow button to switch to the CALC tab. This is the second menu tab at the top of the screen.

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Select 1-Var Stats and press ↵ Enter .

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Press the 2ND button and press 1 to select column L1. You only need to do this step on your T1-84 Plus if you don’t see the “L1” column appearing next to the “List.”

Some non-Plus TI calculators often ignore this screen and display the results automatically.

Tip: If you’ve created multiple lists and want to select a different column, press the number corresponding to that column. For example, if you want to calculate the standard deviation of the values that you entered in column L4, press 2ND and enter 4 . ^{[1] X Research Source}

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Select Calculate and press ↵ Enter . The TI-84 calculator will perform calculations on the standard deviation of the data set.

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Find the standard deviation value next to the entry Sx or σx . These lines are usually the fourth and fifth results in the list. You may need to scroll down to see all values.

Sx is the standard deviation of the sample, and σx represents the standard deviation of the population. The value you will use depends on whether you used the data from the sample or the whole thing. ^{[2] X Research Source}
A low standard deviation indicates that the values in the list do not depend much on the mean, a high standard deviation means that the data set has a wide spread. ^{[3] X Research Sources}
x̄ represents the mean of the data set.
Σx represents the sum of all values.

Steps

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