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STAT 506 - Sampling Theory and Methods
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ANGEL
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Department of Statistics
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Eberly College of Science
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Lesson 2: Confidence Intervals and Sample Size
2.2 Confidence Intervals for Population Proportion
Submitted by gfj100 on Mon, 11/30/2009 - 18:33
Unit Summary
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CI for estimating proportion
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Sample size needed
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Educated Guess
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Conservative approach
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How to choose which to use?
Estimating Proportions
Estimating population proportions can be seen as a particular case of estimating the population mean.
Many things that belong to the problems associated with the mean problem can be borrowed and used
when working with proportions.
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We want to estimate the proportion of units in the population having some attribute. For example a
question might be, "What would be the proportion of Penn State students who are smokers?" Another
example is, "What would be the proportion of people preferring a type of presentation?"
The Gallop Poll: Most are based on telephone interviews with a significant portion based on interviews
conducted in person from home visits. Usually the sample size is at least 1000, sometimes even 1500.

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2.2 Confidence Intervals for Population Proportion STAT 506 - Sampling Theory and Methods

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