还有一个是Graduate School of Arts and Sciences开设的MA Quantitative Methods in the Social Sciences，这是一个类BA的项目;
4 Tell me how you would determine how manypeople are talking on their cell phone at this instant in New York City. When providing your answer，please state all of you assumptions， and walk us through your strategy in detail.What three piece of information would you need to havebefore actually solving this problem?
