lecture02 - Chapter 2 please read Will be doing chapter 3...

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Chapter 2 … please read Will be doing chapter 3 in the next lecture set Some suggested problems: Chapter 2: 2.3, 2.5, 2.7, 2.19
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Which is worse: Not knowing the answer to a question Thinking you know the answer, but being wrong
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There are many ways to collect data. Some provide good information Most don’t How can you tell which is which? Being skeptical about studies and identifying good sampling techniques is key
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Why do we take samples? Why not just measure whole population?
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Consider the following web-poll: www.usatoday.com What do you think about the quality of the data collected?
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This survey reports a summary of the sampled responses Reported numbers are facts No question about their truth …and one may wish to interpret them in terms of the population Statements relating the numbers to the population are inferences . May be right or wrong
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Book (page 21) gives example of call-in poll in labour dispute Follow-up showed that many callers were actively involved in dispute Do results reflect “public opinion”?
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