Confidence intervals, Inputs, Results – HP 39g Graphing Calculator User Manual
Page 132: Confidence intervals -16, One-sample z-interval
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Confidence intervals
The confidence interval calculations that the HP 39G/40G can
perform are based on the Normal Z-distribution or Student’s
t-distribution.
One-Sample Z-Interval
Menu name
Z-INT: 1 |i
This option uses the Normal Z-distribution to calculate a
confidence interval for p, the true mean of a population, when
the true population standard deviation, o, is known.
Inputs
The inputs are:
Field name
Definition
1
Sample mean.
a
Population standard deviation.
n
Sample size.
c
Confidence level.
Results
The results are:
Result
Description
Critical Z
Critical value for Z.
\i min
Lower bound for p.
\x max
Upper bound for p.
9-16
Inference aplet