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Mathematics, 24.02.2020 08:28 Katmcfee7681
Suppose we want 90% confidence interval for the average amount spent on books by freshmen in their first year at a major university. The interval is to have a margin of error of $2. Based on last year's book sales, we estimate that the standard deviation of the amount spent will be close to $30. the number of observations required is closest to a) 865 b) 609 c) 608 d) 30
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