Lecture14

# Lecture14 - Lecture 14 Stat 350 7.3 Large Sample Confidence...

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Lecture 14 Stat 350 7.3 Large Sample Confidence Intervals for a population proportion ( π )

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Homework #5 due on Friday 2/25/2011 Lab #2 due on Saturday 2/26/2011 Weekly SAS Help Session: Staffed by Stat Dept (Han Wu) Wednesday 7 PM – 9 PM SC 283 Office Hour Change: Thursday – 10:30 AM to 11:30 AM
The statistic p (sample proportion) is a point estimate for π (population proportion) unbiased and consistent Example: In order to estimate the President’s job approval rating, we survey a SRS of 300 adults. If 200 of them approve the President’s job performance, what is a point estimator for the President’s job approval rating among all adults? Sample approval rating is p = 200/300 = 67% A point estimate for the overall approval rating π is 67%

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Shortcoming: p provides no information about the precision and reliability of estimation for π Examples: In order to estimate the President’s job approval rating, we survey a SRS of 300 adults. If 200 of them approve
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Lecture14 - Lecture 14 Stat 350 7.3 Large Sample Confidence...

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