Ch. 19 part 1 - STAT 2053 Elementary Statistics Chapter 19...

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STAT 2053 – Elementary Statistics Chapter 19 – Inference about a Population Proportion
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Chapter 19 - Proportions Until now, we had been working with population means. Chapters 19 and 20 focus on inferences about populations proportions (The percent of our whole population that has a specific quality). Statistics about proportions are everywhere: 50% of all marriages end in divorce. 73% of teams who win Game 1 win a best-of- 7 series. 2 Chapter 19
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Proportions We are interested in the unknown proportion of a population that has some outcome (think of this outcome as a “success”). We’re going to call the proportion p . The statistic that estimates the population proportion is called the sample proportion . (Called p-hat) 3 ˆ p = numb erofsuccessesinthesample totalnumberofindividualsinthesample Chapter 19
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Chapter 19 4 Inference about a Proportion Simple Conditions
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Chapter 19 5 Inference about a Proportion Sampling Distribution
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Example : Suppose OSU randomly sampled 127 college students, of whom 107 said that they prayed at least once in a while. 1.What is the p that we are interested in? 1.If 75% of all college students claim they pray
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This note was uploaded on 09/23/2011 for the course STAT 2053 taught by Professor Staff during the Fall '08 term at Oklahoma State.

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Ch. 19 part 1 - STAT 2053 Elementary Statistics Chapter 19...

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