Texas Instruments TI-83 Manual Book page 255

TInterval (one-sample t confidence interval; item )
TInterval 8
computes a confidence interval for an unknown population
mean m when the population standard deviation s is
unknown. The computed confidence interval depends on
the user-specified confidence level.
In the example:
L ={1.6 1.7 1.8 1.9}
6
Data Stats
Input:
, ,
Calculated results:
Inferential Statistics and Distributions 13-17