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There are three kinds of lies: lies, damned lies, and statistics. Benjamin DisraeliBenjamin Disraeli (1804 - 1881)

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Presentation on theme: "There are three kinds of lies: lies, damned lies, and statistics. Benjamin DisraeliBenjamin Disraeli (1804 - 1881)"— Presentation transcript:

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2 There are three kinds of lies: lies, damned lies, and statistics. Benjamin DisraeliBenjamin Disraeli ( )

3 Taken from Triola, Essentials of Statistics. Addison Wesley. Misleading Scale

4 Misleading Scale

5 Missing Numbers

6 Double the length, width, and height of a cube, and the volume increases by a factor of eight Taken from Triola, Essentials of Statistics. Addison Wesley. Pictographs

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8 Choice of Sample In 1936 Literary Digest magazine sent more than 10 million ballots to readers to get their preferences in the upcoming presidential election between Franklin D. Roosevelt and Alfred M. Landon. The returns indicated that Landon, the Republican nominee, would win handily. Roosevelt won in the first great landslide election of the 20th century. He carried all states except Maine and Vermont.

9 In an ABC Nightline poll, 186,000 viewers each paid 50 cents to call a “900” telephone number with their opinion about keeping the United Nations in the United States. The results showed that 67% of those who called were in favor of moving the United Nations out of the United States. Taken from Triola, Essentials of Statistics. Addison Wesley. Choice of Sample

10 The Hawaii State Senate held hearings when it was considering a law requiring that motorcyclists wear helmets. Some motorcyclists testified that they had been in crashes in which helmets would not have been helpful. Which important group was unable to testify? Taken from Triola, Essentials of Statistics. Addison Wesley. Choice of Sample

11 “Have you ever used illegal drugs?" “Do you favor a constitutional admendment that would outlaw most abortions?" “Have you had more than one sexual partner in the past 6 months?" “Have you ever driven a motor vehicle while intoxicated?" Choice of Sample Possibility of Lying

12 97% yes: “Should the President have the line item veto to eliminate waste?” 57% yes: “Should the President have the line item veto, or not?” Taken from Triola, Essentials of Statistics. Addison Wesley. Question Phrasing

13 Would you say that traffic contributes more or less to air pollution than industry? 45% blamed traffic, 27% blamed industry Would you say that industry contributes more or less to air pollution than traffic? 24% blamed traffic, 57% blamed industry Taken from Triola, Essentials of Statistics. Addison Wesley. Question Phrasing

14 “Welfare” vs. “Care for the poor” “Pro-abortion” vs. “pro-choice” Others? Question Phrasing

15 A study showed that truck drivers weigh more than adults who do not drive trucks. Conclusion: Trucks cause people to gain weight. Taken from Triola, Essentials of Statistics. Addison Wesley. Correlation vs. Causation

16 The number of people per television in a country is negatively correlated with the average life expectancy. Can we conclude that one causes the other?

17 Ice cream sales and number of drownings are correlated. Does this mean that eating ice cream causes drowning? Or that people eat more ice cream after someone drowns? Taken from Against all Odds. Video on Demand from Annenberg.

18 Mistakes As reported by CNN and USA Today, the poll found … fewer than one in five – 18 percent – in six of the nine countries believe Arabs carried out the September 11 terrorist attacks. (Three countries wouldn't let Gallup polltakers ask the question.) You won't find those results on Gallup's Web site, however. That's because of one rather big problem: These eye-opening results were "actually the average for the countries surveyed regardless of the size of their populations," the NCPP noted. "Kuwait, with less than 2 million Muslims, was treated the same as Indonesia, which has over 200 million Muslims." By Richard Morin and Claudia Deane Washington Post Staff Writers Friday, March 22, 2002


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