Confidence Intervals - HP 40G User Manual

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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
Z–INT: 1 µ
Menu name
This option uses the Normal Z–distribution to calculate a
confidence interval for µ, the true mean of a population, when
the true population standard deviation, σ, is known.
Inputs
The inputs are:
Field name
x
σ
n
C
Results
The results are:
Result
Critical Z
µ min
µ max
9-16
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Definition
Sample mean.
Population standard deviation.
Sample size.
Confidence level.
Description
Critical value for Z.
Lower bound for µ.
Upper bound for µ.
Inference aplet