Section 10 - Statistics An Introduction Fifth Edition...

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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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