Operation Manual

Chapter 13: Inferential Statistics and Distributions 237
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.
c
2
-Test
c
2
-Test (chi-square test; item C) computes a chi-square test for association on the two-way table of
counts in the specified Observed matrix. The null hypothesis H
0
for a two-way table is: no association
exists between row variables and column variables. The alternative hypothesis is: the variables are
related.
Input:
Calculated
results:
Input:
Calculated
results: