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

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

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STAT 506 - Sampling Theory and Methods ANGEL Department of Statistics Eberly College of Science Home // 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 CI for estimating proportion Sample size needed Educated Guess Conservative approach 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. .. 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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