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The National Geographic Society conducted a study that included 3000 respondents, age 18 to 24, in nine different countries (San Luis Obispo Tribune, November 21, 2002). The society found that 10% of the participants could not identify their own country on a blank world map.

a. Construct a 90% confidence interval for the proportion who can identify their own country on a blank world map.

b. What assumptions are necessary for the confidence interval in Part (a) to be valid?

c. To what population would it be reasonable to generalize the confidence interval estimate from Part (a)?

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