Texas Instruments TI-83 Manual Book page 258

)
(one-proportion z confidence interval; item )
1-PropZInt
1.PropZInt A
computes a confidence interval for an unknown proportion
of successes. It takes as input the count of successes in the
sample x and the count of observations in the sample n.
The computed confidence interval depends on the user-
specified confidence level.
Input:
,
Calculated results:
13-20 Inferential Statistics and Distributions