Digital SAT Math Practice Question #1642
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Halve margin of error -> multiply sample size by 2^2 = 4. 400 * 4 = 1,600.
Margin of error is inversely proportional to the square root of the sample size: \(ME \propto \frac{1}{\sqrt{n}}\). To halve the margin of error (divide by 2), the sample size must be multiplied by \(2^2 = 4\). \(400 \times 4 = 1,600\)....
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