The Excite Poll can be found online at . The question appears on the screen, and you simply click buttons to vote "Yes," "No," or "Not sure." On January 25, 2000, the question was "Should female athletes be paid the same as men for the work they do?" In all, 13,147 respondents (44%) said "Yes," another 15,182 (50%) said "No," and the remaining 1448 said "Don't know."

(a) What is the sample size for this poll?

(b) That's a much larger sample than standard sample surveys. In spite of this, we can't trust the result to give good information about any clearly defined population. Why?