An author wrote a book about churches and charity work. Her conclusions were based on 5,617 replies received after mailing 141,566 questionnaires.
Are her conclusions likelty to be valid in the sense that they can be applied to the general population? Wh or why not?
A) Yes, the number were precise.
B) No, it was a voluntary response sample.
C) Yes, enough responses were received to make valid conclusions.
D) No, not enough responses were received to make valid conclusions.
