A random sample of 100 high-school dropouts in pittsburgh, Ask an Expert

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A random sample of 100 high-school dropouts in Pittsburgh aged 17 to 19 revealed that 20% of them were unemployed.

a. Place a 95% confidence interval on the percentage of all similar people in that area who are unemployed.

b. The average unemployment rate for the entire work force in Pittsburgh is 7.0%. Is the unemployment rate among high-school dropouts significantly higher than for the entire work force? Justify your answer.

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