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1. (20 points) If the variance of a national accounting examination is 1600, how large a sample is needed to estimate the true mean score

1. (20 points) If the variance of a national accounting examination is 1600, how large a sample is needed to estimate the true mean score within 5 points with 95% confidence? (1.960 7=5 5 + 1600 NICCO 73.45 83.4

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