To Compute a Confidence Interval for Dependent Samples (Paired Data)

  1. Store your data in two lists, L1 and L2 for example.
  2. Create a list of the differences by scrolling over and up until L3 is highlighted. Then press 2nd 1 minus 2nd 2, and press ENTER. This stores a list of differences in L3.
  3. Press STAT.
  4. Press the right arrow key to scroll over to the TESTS menu.
  5. Press the down arrow key to scroll down until TInterval is highlighted.
  6. Press ENTER.
  7. Highlight Data.
  8. Press ENTER.
  9. Specify the location of the list of differences (L3 in our example above), the frequency (usually 1), and the confidence level formatted as a decimal.
  10. Highlight Calculate and press ENTER.
  11. The calculator should now display the desired confidence interval.


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Statistical Calculator Packet - New OS by Whatcom Community College is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License, except where otherwise noted.

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