Two–Sample Z–Interval - HP 40G User Manual

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Two–Sample Z–Interval
Menu name
Inputs
Results
Inference aplet
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Z–INT: µ1– µ2
This option uses the Normal Z–distribution to calculate a
confidence interval for the difference between the means of
two populations, µ – µ
, when the population standard
1 2
deviations, σ and σ
, are known.
1 2
The inputs are:
Field name Definition
Sample 1 mean.
x1
Sample 2 mean.
x2
n1 Sample 1 size.
n2 Sample 2 size.
σ1
Population 1 standard deviation.
σ2
Population 2 standard deviation.
C Confidence level.
The results are:
Result Description
Critical Z Critical value for Z.
Lower bound for µ
∆ µ Min
Upper bound for µ
∆ µ Max
– µ
.
1 2
– µ
.
1 2
9-17