Question 1157140
{{{1.96(2.4/sqrt(n))}}} = 0.35
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{{{4.704/sqrt(n)}}} = 0.35
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{{{0.35*sqrt(n)}}} = 4.704
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{{{sqrt(n)}}} = 13.44
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n = 180.63
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You will need a minimum sample size of 181 high school students.