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John wishes to estimate the population standard deviation of salary of college graduates who took a statistics course in college. How many college graduates must he survey? Assume that he wants to be the sample standard deviation to be within $30%$ of the population standard deviation and to be $99%$ confident of that statement.
John wishes to estimate the population standard deviation of salary of college graduates who took a statistics course in college. How many college graduates must he survey? Assume that he wants to be the sample standard deviation to be within $30%$ of the population standard deviation and to be $99%$ confident of that statement.

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