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Suppose we want a 90% confidence interval for the average amount spent on books by freshmen in their first year at a major university. The
Suppose we want a 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 will be close to $30. The
number of observationsrequired is closest to:
609
25
608
865
30
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