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If we want to study a population with a variance of 1600, and a sample of 400 is chosen at random. To obtain a 95%

If we want to study a population with a variance of 1600, and a sample of 400 is chosen at random. To obtain a 95% confidence interval, the margin of error is 3.92 a. b. 20 C. 40 d. 400 1600

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