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The Republic of South Africa wants to survey the educational level of its native African citizens. Under apartheid, education levels varied widely. We analyze some

The Republic of South Africa wants to survey the educational level of its native African citizens. Under apartheid, education levels varied widely. We analyze some historical records and determine that most native Africans would have had between 0 and 18 years of education. If the Republic wants to build a 99% Confidence Interval for Average Years of Education with a Margin of Error of 0.5 years, how many Subjects do they need to interview?

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