You want to estimate the mean SAT score of all college applicants with margin of error of 15. You know


You want to estimate the mean SAT score of all college applicants with margin of error of 15. You know the standard deviation of SAT scores is historically 100. Find the sample size needed to estimate the mean with 90% confidence. Critical Values: Z0.05 1.645 Z0.025 = 1.96 Z0.01 = 2.325 Z0.005 = 2.575


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