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Topic: TI-82 confidence interval programs
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Jacki

Posts: 6
Registered: 12/3/04
TI-82 confidence interval programs
Posted: Feb 14, 1997 8:47 AM
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Hello all,

First I want to say thanks for the information and expertise that y'all are
willing to share. I am going to be brave and share my confidence interval
programs for the TI-82 with you. They are called CI1SAMP and CI2SAMP. They
both use subroutines which I got from the TI site. GAMMA and TSUB were
written by Michael Lloyd of Henderson State, and ZSUB is basically his ZVAL
program. I do want to give credit where credit is due :-)!

Here are the two programs and the necessary sub-programs. I am attaching the
files as UUE encoded file to this email. The files are grouped (named
CONFINT.UUE) so you will need the Graph-Link to unencode and ungroup them. I
have "protected" the files, but only to prevent students from losing lines
out of it.

A couple of pieces of info about the programs:

1) Both of them start with a clear home screen and line that tells which
program it is. I built in a pause at this point. Simply press [enter] to
continue the program.
2) The students will have to choose whether to use Z or T, but the program
will then calculate the appropriate critical value for either distribution -
regardless of confidence level. **I know there have been recent discussions
concerning the use of z and/or t, but this choice will allow the students to
get the answers that the textbooks give.**
3) For "LEVEL?", they need to enter it in decimal form (.95 instead of 95%)
4) For the proportions, they will need to enter the number of successes and
not the probability of success. I did it this way since that is the way the
TI-83 does it.

These do not show a graphical response, but I'm sure that could be added
fairly easily. I just haven't had the time. Neither have I had the time to
make the necessary changes to do a hypothesis test. Surely a few
modifications to these programs will be sufficient. I am going to try to do
that this weekend.

Let me know what you think of these. I don't *think* there are any mistakes in
them, but if you discover any problems, please let me know (my students are
already using these). If there are any problems with the grouped encoded
version (with all the mail systems out there, you never know), email me and I
will send an ASCII version.


Jacki Jonas
Math/Stats Instructor
Northeast State Technical Community College
Blountville, TN

email: jrjonas@nstcc.cc.tn.us (school)

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