A Random Sample of 250 Students at a University Finds $15.8 \pm .010$

Multiple Choice

A random sample of 250 students at a university finds that these students take a mean of 15.8 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 90% confidence interval. Round to the nearest
Thousandth.

A) $15.8 \pm .010$
B) $15.8 \pm .158$
C) $15.8 \pm .239$
D) $15.8 \pm .015$