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.

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The Answer of 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.

Suppose That a Survey of 20,000 High School Students (10,000