Inferential Statistics and Distributions 13-15
8313INFE.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:47 PM Printed: 02/19/01 1:38 PM
Page 15 of 36
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
ƒ
p
2
(
p1:
ƒ
p2
)
•
H
a
: p
1
<p
2
(
p1:<p2
)
•
H
a
: p
1
>p
2
(
p1:>p2
)
Input:
,
Calculated results:
,
Drawn results:
2-PropZTest
