Chapter 13: Inferential Statistics and Distributions 232
1-PropZInt
1-PropZInt (one-proportion z confidence interval; item A) computes a confidence interval for an
unknown proportion of successes. It takes as input the count of successes in the sample
x and the
count of observations in the sample
n. The computed confidence interval depends on the user-
specified confidence level.
2-PropZInt
2-PropZInt (two-proportion z confidence interval; item B) computes a confidence interval for the
difference between the proportion of successes in two populations (p
1
Np
2
). It takes as input the
count of successes in each sample (
x
1
and x
2
) and the count of observations in each sample
(
n
1
and n
2
). The computed confidence interval depends on the user-specified confidence level.
Input:
Calculated
results:
Input:
Calculated
results:
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