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Chapter 13: Inferential Statistics and Distributions 228
2-PropZTest
2-PropZTest (two-proportion z test; item 6) computes a test to compare the proportion of successes
(p
1
and p
2
) from two populations. 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
). 2-PropZTest tests the null hypothesis
H
0
: p
1
=p
2
(using the pooled sample proportion Ç) against one of the alternatives below.
•H
a
: p
1
ƒp
2
(p1:ƒp2)
•H
a
: p
1
<p
2
(p1:<p2)
•H
a
: p
1
>p
2
(p1:>p2)
Input:
Calculated
results:
Drawn
results:
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