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Inference aplet 9-17
One-Proportion Z-Interval
Menu name Z-INT: 1 π
This option uses the Normal Z-distribution to calculate a
confidence interval for the proportion of successes in a
population for the case in which a sample of size, n, has
a number of successes, x.
Inputs The inputs are:
Results The results are:
Two-Proportion Z-Interval
Menu name Z-INT: π1 – π2
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:
Field
name
Definition
x Sample success count.
n Sample size.
C Confidence level.
Result Description
Critical Z Critical value for Z.
π Min Lower bound for π.
π Max Upper bound for π.
Field
name
Definition
Sample 1 success count.
Sample 2 success count.
x1
x2