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Inference aplet 9-19
Two–Proportion Z–Interval
Menu name Z–INT: P1 – P2
This option uses the Normal Z–distribution to calculate a
confidence interval for the difference between the proportions
of successes in two populations.
Inputs The inputs are:
Results The results are:
Field name Definition
Sample 1 success count.
Sample 2 success count.
n1 Sample 1 size.
n2 Sample 2 size.
C Confidence level.
x1
x2
Result Description
Critical Z Critical value for Z.
π Min
Lower bound for the difference between
the proportions of successes.
π Max
Upper bound for the difference between the
proportions of successes.
∆
∆