A researcher wants to estimate the mean cost of textbooks per year for students at a large university. He wants a margin of error of $10 for a 95% confidence interval. If the standard deviation of those costs is assumed to be $50, what is the minimum sample size he should use?

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The Answer of A researcher wants to estimate the mean cost of textbooks per year for students at a large university. He wants a margin of error of $10 for a 95% confidence interval. If the standard deviation of those costs is assumed to be $50, what is the minimum sample size he should use?

A Researcher Wants to Estimate the Mean Cost of Textbooks