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Inference aplet 9-17
Two–Sample Z–Interval
Menu name 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
1
– µ
2
, when the population standard
deviations, σ
1
and σ
2
, are known.
Inputs The inputs are:
Results The results are:
Field name Definition
Sample 1 mean.
Sample 2 mean.
n1 Sample 1 size.
n2 Sample 2 size.
σ1 Population 1 standard deviation.
σ2 Population 2 standard deviation.
C Confidence level.
x1
x2
Result Description
Critical Z Critical value for Z.
µ Min
Lower bound for µ
1
– µ
2
.
µ Max
Upper bound for µ
1
– µ
2
.
∆
∆