A polling agency is employed to investigate the voting intention of residents in a…
MATHEMATICS · Multi-part · AP · AP Statistics · Collecting Data · Collecting Data
Problem
A polling agency is employed to investigate the voting intention of residents in a particular electorate. From the data collected, they want to predict the election result for that electorate in the next election. Explain why each of the following situations may produce a biased sample:
(1) A random selection of people in the local large shopping complex is surveyed between 1 pm and 3 pm on a weekday.
(2) The members of the local golf club are surveyed.
(3) A random sample of people at the local train station between 7 am and 9 am are surveyed.
(4) A door to door visit is undertaken, surveying every voter in a particular street.