Confidence interval for sat scores
A college wants to know the lower limit of a two-sided 95% confidence interval for SAT scores on the Math section (range equals 200 to 800). They sampled 400 students and found that the sample mean was 550 and the sample standard deviation was 80.
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Mall security estimates that the average daily per-store theft is exactly $200, but wants to determine the accuracy of this statistic. The company researcher takes a sample of 81 clerks and finds that =$180 and s = $40.
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