Lecture_18,_Chap_9,_Sec_3_&_5

Lecture_18,_Chap_9,_Sec_3_&_5 - Chapter 9 Section 3...

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Chapter 9 Section 3 Confidence Intervals about a Population Proportion
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Confidence Intervals for Proportions Learning objectives Get a point estimate for the population proportion Construct and interpret a confidence interval for the population proportion Determine the sample size necessary for estimating a population proportion within a specified margin of error 1 2 3
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Confidence Intervals for Proportions In Section 1, we calculated confidence intervals for the mean, assuming that we knew σ In Section 2, we calculated confidence intervals for the mean, assuming that we did not know σ In this section, we construct confidence intervals for situations when we are analyzing a population proportion The issues and methods are quite similar
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Confidence Intervals for Proportions When we analyze the population mean, we use the sample mean as the point estimate The sample mean is our best guess for the population mean The sample mean is our best guess for the population mean When we analyze the population proportion, we use the sample proportion as the point estimate The sample proportion is our best guess for the population proportion
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Confidence Intervals for Proportions Learning objectives Obtain a point estimate for the population proportion Construct and interpret a confidence interval for the population proportion Determine the sample size necessary for estimating a population proportion within a specified margin of error 1 2 3
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Confidence Intervals for Proportions Confidence intervals for the population mean are Centered at the sample mean Plus and minus z α/2 times the standard deviation of the sample mean (the standard error from the sampling distribution) Centered at the sample mean
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Confidence Intervals for Proportions
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This note was uploaded on 08/04/2008 for the course STAT 250 taught by Professor Sims during the Spring '08 term at George Mason.

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Lecture_18,_Chap_9,_Sec_3_&_5 - Chapter 9 Section 3...

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