A Random Sample of 250 Students at a University Finds $15.3 \pm .198$

Multiple Choice

A random sample of 250 students at a university finds that these students take a mean of 15.3 credit hours per quarter with a standard deviation of 1.6 credit hours. Estimate the mean credit hours taken by a student each quarter using a 95% confidence interval. Round to the nearest thousandth.

A) $15.3 \pm .198$
B) $15.3 \pm .010$
C) $15.3 \pm .013$
D) $15.3 \pm .157$