
Two-Sample Z-!nterval
Menu name
Z^NT: 111- |i2
This option uses the Normal Z-distribution to calculate a
confidence interval for the difference between the means of
two populations, Pi - P2> when the population standard
deviations, O] and 02, are known.
Inputs The inputs are:
Field name Definition
il
Sample 1 mean.
x2
Sample 2 mean.
nl Sample 1 size.
n2 Sample 2 size.
al Population 1 standard deviation.
o2 Population 2 standard deviation.
C Confidence level.
Results The results are:
Result
Description
Critical Z
Critical value for Z.
A p Min
Lower bound for pj - P2.
ts p Max
Upper bound for P[ - P2.
Inference aplet
9-17
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