Texas Instruments TI-83 Manual Book page 254

ZInterval (one-sample z confidence interval; item )
ZInterval 7
computes a confidence interval for an unknown population
mean m when the population standard deviation s is
known. The computed confidence interval depends on the
user-specified confidence level.
In the example:
L ={299.4 297.7 301 298.9 300.2 297}
1
Data Stats
Input:
, ,
Calculated results:
13-16 Inferential Statistics and Distributions