Passage 1: (Unseen passage)
A survey was conducted to find out the use of cosmetics among female students of Bangkok University. To do so, they interviewed female sophomores at Rangsit campus on last Wednesday afternoon. However, this survey did not use any statistical formulation such as the Yamane Formula to determine the sample size. The result showed that 80% of the interviewees used many kinds of cosmetics, while 15% used only one kind of cosmetics. The rest did not want to express their opinions. Therefore, the agency in charge of the survey concluded that 80% of female students of Bangkok University have favored varieties of cosmetics.