Operation Manual

Chapter 13: Inferential Statistics and Distributions 233
1-PropZTest
1-PropZTest (one-proportion z test; item 5) computes a test for an unknown proportion of successes
(prop). It takes as input the count of successes in the sample
x and the count of observations in the
sample
n. 1-PropZTest tests the null hypothesis H
0
:prop=p
0
against one of the alternatives below.
•H
a
: propƒp
0
(prop:ƒp0)
•H
a
: prop<p
0
(prop:<p0)
•H
a
: prop>p
0
(prop:>p0)
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)
Input:
Calculated
results:
Drawn
results: