A Group of Statistics Students Decided to Conduct a Survey

Multiple Choice

A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. Assuming a population standard deviation of three hours,what is the required sample size if the error should be less than a half hour with a 99% level of confidence?

A) 196
B) 239
C) 15
D) 16