2.20. You plan to sample from the 3500 undergraduate students enrolled at the University of Rochester, to compare the proportions of female and male students who would like to see the U.S. have a female President.

(a) Suppose that you use random numbers to select students, but you stop selecting females as soon as you have 40, and you stop selecting males as soon as you have 40. Is the resulting sample a simple random sample? Why or why not?

(b) What type of sample is the sample in (a)? What advantage might it have over a simple random sample?