# SAT Math Multiple Choice Question 750: Answer and Explanation

### Test Information

Question: 750

15. A researcher is trying to estimate the daily amount of time undergraduate computer science majors spend on nonrecreational computer activities. She surveys 120 students from among the computer science majors at a large state university and asks them, "How much time do you spend in nonrecreational computer activities each day?" The mean of these responses is 210 minutes per day, with a standard deviation of 16.5 minutes. If another researcher wishes to present the same question to a new set of subjects at the same university, which of the following subject groups would most likely yield a data set with a smaller margin of error for the estimated daily amount of time undergraduate computer science majors spend on nonrecreational computer activities?

• A. 240 randomly selected computer science majors
• B. 240 randomly selected liberal arts majors
• C. 80 randomly selected computer science majors
• D. 80 randomly selected liberal art majors