Your professor wishes to estimate the proportion of high school students enrolled in college-level courses each school year. How large a sample is necessary if she wishes to be 99% confident with a margin of error of 3.5 percent? From an old 1999 study, the percentage of high school students enrolled in college-level courses was estimated to be 18.3%.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Your professor wishes to estimate the proportion of high school students enrolled in college-level courses each school year.  How large a sample is necessary if she wishes to be 99% confident with a margin of error of 3.5 percent?  From an old 1999 study, the percentage of high school students enrolled in college-level courses was estimated to be 18.3%.

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