It Is Desired to Estimate the Average Time It Takes $n = 189$

Multiple Choice

It is desired to estimate the average time it takes Statistics students to finish a computer project to within two hours at 90% reliability. It is estimated that the standard deviation of the times is 14 hours. How large a sample should be taken to get the desired interval?

A) $n = 189$
B) $n = 231$
C) $\mathrm { n } = 325$
D) $n = 133$