A random sample of 250 students at a university finds that these students take a mean of 15.2 credit hours per quarter with a standard deviation of 2.3 credit hours. Estimate the mean credit hours taken by a student each quarter using a 95% confidence interval. Round to the nearest thousandth. 15.2 ± 0.285 15.2±0.018 15.2±0.012 O 15.2 ± 0.188

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