How to Find Confidence Intervals on a TI-83

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When calculating statistical data, it's nearly impossible to leave every stone unturned. Statistics are almost always based on a sample of all available data. For example, you can't record the height of every adult in the United States, but you can take a representative sample of adult heights in the country and generate a fairly accurate statistic. With the help of confidence intervals, you can also calculate a range for possibly erroneous data in your stats. Use a Ti-83 calculator to work out the confidence intervals of your stats.

  • Power on your Ti-83. Press the Stat button and then press Enter to launch the Stat List editor. Use the Ti-83 directional keypad to highlight the Stat Editor L1 option. Press the orange 2nd button on the keypad.

  • Type a name for your data, and then press the Enter button. The name will display at the top of the Stat Editor's left column.

  • Enter your data into the rows of the left-hand column. Use the up and down arrows on the Ti-83 directional keypad to move between rows. Press the Enter button after you have entered your data into one of the rows.

  • Press the Stat button. Navigate to the Tests heading and then go to the 8:TInterval option below the Tests heading. Press the Enter button.

  • Select the Data option from the T-Interval menu. Navigate down the menu to the C-Level option, and then enter a percentage for your confidence level.

  • Scroll to the Calculate option in the TInterval menu to calculate your confidence interval.

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