1
Statistics:
An Introduction
Fifth Edition
421
Section 10:
Inferential Techniques for
Proportions
A.
Introduction
Recall that for large
n
(
n
≥
100) the sampling
distribution for a proportion if approximately normal
with standard error
B.
Hypothesis Tests
Hypothesis tests for proportions can be conducted
based on this sampling theory.
p
(1
)
n
422
Section 10:
Inferential Techniques for
Proportions
Example:
Poll.
Question:
Does the proportion of
students at the University of Iowa that approve of
the job Culver is doing as Governor differ from .50?
Study:
Randomly sample 100 students and find
proportion approving in the sample.
Step 1.
State null and alternative hypotheses.
5
.
:
5
.
:
5
.
:
2
1
0
H
H
H

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