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Margin of Error

Margin of Error. 12-11-08 Ms. Sia IMP4. Today’s Agenda. Review problem from Tuesday (about City Hall) Polling Puzzles p. 434. Announcements . Extra credit assignments can be found at the back of the book from p. 445 to 454 (any of the Supplemental Problems) HW Hall today until 4:30pm

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Margin of Error

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  1. Margin of Error 12-11-08 Ms. Sia IMP4

  2. Today’s Agenda • Review problem from Tuesday (about City Hall) • Polling Puzzles p. 434

  3. Announcements • Extra credit assignments can be found at the back of the book from p. 445 to 454 (any of the Supplemental Problems) • HW Hall today until 4:30pm • Pollster’s Dilemma Unit Test is next Thursday, December 18th

  4. REMEMBER • Margin of error is the “radius” of a confidence interval, or the distance that the interval extends in either direction from the mean. • Confidence intervals can take on values that are non-integer multiples of  • When margin of error is mentioned without mentioning the confidence interval, we should assume that it refers to a 95% confidence level.

  5. City Hall • Issue: City Hall decides to let Chicago’s homeless people sleep in City Hall at night. • After taking a poll, a local newspaper finds that 52% favor the plan, with a margin of error of plus or minus 4%. • What is the confidence interval for this poll? • Explain what it means to say that the poll has a 95% confidence level. • How large is 2s? How large is s? • Approximately how many people were in the sample?

  6. Polling Puzzles p. 434 • When we don’t know p, what should we assume? • Show all your work, include explanations IN WORDS. • Turn this in at the end of class.

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