How can I keep my calculations in exact form on the TI-89?

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  • Thread starter Thread starter Poisonous
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Discussion Overview

The discussion revolves around how to maintain calculations in exact form on the TI-89 calculator, specifically within the "Stats/List Editor." Participants are exploring methods to prevent results from being displayed as decimals and seeking solutions for homework-related issues.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes their difficulty in keeping calculations in exact form, providing examples of inputs and outputs from the TI-89.
  • Another participant suggests changing the "Exact/Approx" setting from "Auto" to "Exact" as a potential solution.
  • A different participant reports that the suggested solution did not work for them in the stats/list editor.
  • One participant claims that the setting worked for them, indicating a possible discrepancy in experiences.
  • Another participant notes that while the input shows in exact form, the calculated results still appear as approximate decimals.

Areas of Agreement / Disagreement

Participants express differing experiences regarding the effectiveness of the "Exact/Approx" setting, indicating that there is no consensus on a solution that works universally for all users.

Contextual Notes

Some limitations may arise from the specific functionalities of the TI-89's stats/list editor, which could affect the ability to maintain exact forms in calculations.

Poisonous
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Homework Statement



I've been trying, with no success, for the past few hours to find a way to keep calculations done in the TI-89's "Stats/List Editor" in exact form instead of decimal. For example, when I enter the following information:

http://img19.imageshack.us/img19/4061/prob1y.jpg

I get:

http://img25.imageshack.us/img25/2123/prob2y.jpg

Where I want p1_hat to be 22/36, p2_hat to be 20/23, etc..

The Attempt at a Solution



I know in the older TI's you could do something like, Math->exact->p1_hat, and it would give it to you, but if I do Math->numbers->exact()->exact(statvars\p1_hat) I get the following:

http://img11.imageshack.us/img11/9542/prob3.jpg

If you know of a way or another program that I can download to get the exact forms, I'd be very grateful!
 
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press "mode" and change the "Exact/Approx" setting from "Auto" to "Exact". Then re-input your data.
 
I've tried it. It doesn't work with the stats/list editor :(
 
Huh. It did for me.
 
Well, the infomation that I enter shows in exact form, but the calculated information is still is approximte. The p1_hat, for example, still shows as .6111111111.
 

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