Suppose that a survey of 20,000 high school students (10,000 ...

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Suppose that a survey of 20,000 high school students (10,000 girls and 10,000 boys) was done. Students were asked if they had used cocaine during the last 30 days. 4.9 of the boys and 4.2 of the girls reported using cocaine. The difference between the two percentages is statistically significant. Explain why this difference may not be practically significant.

Question 2

Over a 30-year period, the rate of the number of people killed by lightning compared to people killed by hurricanes was 350. If the number of people killed by hurricanes was 16, what was the number of people killed by lightning? Is lightning a major cause of death?

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Answer to Question 1

The difference between 4.9 and 4.2 is only 0.7. It would make sense to report the combined result as 4.6 of high school students said they had used cocaine during the last 30 days.

Answer to Question 2

The number killed by lightning is only 72 over a 30-year period. Lightning is not a major cause of death.

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TY

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