# >> College Life >> College Academics

How to Find Confidence Intervals on a Ti-83

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. With the help of your Ti-83 calculator, you can calculate the confidence intervals of your stats.

Instructions

- 1
  Power on your Ti-83 -- press the "On" button. Press the "Stat" button and then press "Enter." The "Stat List" editor will launch. Use the Ti-83 directional keypad to highlight the Stat Editor "L1" option. Press the orange "2nd" button.
- 2
  Key in a name for your data, and then press the "Enter" button. The name will be displayed at the top of the Stat Editor's left column.
- 3
  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.
- 4
  Press the "Stat" button. Navigate to the "Tests" heading. Navigate down to the "8:TInterval" option below the "Tests" heading. Press the "Enter" button.
- 5
  Select the "Data" option from the TInterval menu. Navigate down the menu to the "C-Level" option, and then enter a percentage for your confidence level.
- 6
  Navigate down to the "Calculate" option in the TInterval menu to calculate your confidence interval.

Xenia, Ohio Colleges

What Are Key Economic Indicators?

College Academics