lecture04 - Read page 44 on confidence statements Chapter 4...

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Read page 44 on “confidence statements” Chapter 4 … please read
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A 2004 Gallop poll indicated that “ a slight majority of Americans (51% to 45%) supported a constitutional amendment that would define marriage as being between a man and a woman only The poll was based on a random sample of n = 2,527 adults Is 51% really evidence that the majority of Americans favour such an amendment?
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Confidence statement: Margin of error Confidence level:
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A 2004 Gallop poll indicated that “ a slight majority of Americans (51% to 45%) supported a constitutional amendment that would define marriage as being between a man and a woman only The poll was based on a random sample of n = 2,527 adults Is 51% really evidence that the majority of Americans favour such an amendment?
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What does this say about whether there is a majority of Americans who support the amendment?
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Sampling in the real world is tricky Many people choose not to participate Questions have to be designed to not influence the response Question takers have to be properly trained … and so on …
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When you dial a random number, what are the possible things that can happen?
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that you automatically get answers to your questions. Is this a problem?
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lecture04 - Read page 44 on confidence statements Chapter 4...

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