CINT (Confidence Interval Converter) Program for TI-83 or TI-83 PLUS
Written by Mr. Hansen
Rev. 2/17/2005

Purpose: Although the TI-83 does an excellent job of producing confidence intervals (STAT TESTS 8, etc.), the calculator always gives the answer using interval notation. Frequently it is more useful to have the answer presented in the “estimate ± m.o.e.” format, and that is what CINT does. Simply execute this program immediately after you have used STAT TESTS to calculate a confidence interval.

Please note that the keywords Disp, upper, and lower are not to be entered by using the ALPHA key. Instead, use PRGM I/O 3 to get Disp (while entering the program), and use VARS 5 TEST H and I to get upper and lower, respectively.

Program Listing:

:Disp "ESTIMATE"
:(upper+lower)/2®E
:Disp E
:Disp "M.O.E."
:E-lower®M
:Disp M