Confidence Intervals; One-Sample Z-Interval - HP 39G User Manual

Confidence intervals

One–Sample Z–Interval
Menu name
Inputs
Results
9-16
The confidence interval calculations that the HP 39G/40G can
perform are based on the Normal Z–distribution or Student's
t–distribution.
Z–INT: 1
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.
The inputs are:
Field name Definition
Sample mean.
x
Population standard deviation.
n Sample size.
C Confidence level.
The results are:
Result Description
Critical Z Critical value for Z.
min Lower bound for .
max Upper bound for .
Inference aplet