Texas Instruments TI-83 Manual Book page 256

2-SampZInt (two-sample z confidence interval; item )
2.SampZInt 9
computes a confidence interval for the difference between
Nm
two population means (m ) when both population
1 2
standard deviations ( s and s
) are known. The computed
1 2
confidence interval depends on the user-specified
confidence level.
In the example:
LISTC={154 109 137 115 140}
LISTD={108 115 126 92 146}
Data Stats
Input:
, ,
Calculated results:
13-18 Inferential Statistics and Distributions