Mathematics, 04.08.2020 14:01 chloesmolinski0909
9. A college financial advisor wants to estimate the mean cost of textbooks per quarter for students at the college. For the estimate to be useful, it should have a margin of error of 20 dollars or less. The standard deviation of prices is estimated to be around 100 dollars. How large of a sample size needs to be used to be 95% confident, with the given margin of error?
Answers: 3
= standard deviation
= Two tailed z-value.
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