HP Prime Graphing Calculator - Manual (Page 255)

Inference app 251
Confidence intervals
The confidence interval calculations that the HP Prime can
perform are based on the Normal Z-distribution or
Student’s t-distribution.
One-Sample Z-Interval
Menu name Z-Int: 
This option uses the Normal Z-distribution to calculate a
confidence interval for , the true mean of a population,
when the true population standard deviation, , is known.
Inputs The inputs are:
Results The results are:
Two-Sample Z-Interval
Menu name Z-Int: 
1
– 
2
This option uses the Normal Z-distribution to calculate a
confidence interval for the difference between the means
of two populations, 

–

, when the population standard
deviations, 
1
and 
2
, are known.
Field
name
Definition
Sample mean
n Sample size
 Population standard deviation
C
Confidence level
x
Result Description
C Confidence level
Critical Z Critical values for Z
Lower Lower bound for 
Upper Upper bound for 