Cable company market research, part 2. Four new sampling strategies have been pr
ID: 3023867 • Letter: C
Question
Cable company market research, part 2. Four new sampling strategies have been proposed to help PTV determine whether enough cable subscribers are likely to purchase high-speed Internet Service. For each, indicate what kind of sampling strategy is involved and what (if any) biases might result.
A) Run a poll on the local TV news, asking people to dial one of two phone numbers to indicate whether they would be interested.
B) Hold a meeting in each of the fifteen towns, and tally the opinions expressed by those who attend the meetings
C) Randomly select one street in each town and contact each of the households on that street.
D) Go through the company’s customer records, selecting every 40th subscriber. Send employees to those homes to interview the people chosen.
Explanation / Answer
A) Run a poll on the local TV news, asking people to dial one of two phone numbers to indicate whether they would be interested.
Simple random sampling (with Voluntary response bias)
B) Hold a meeting in each of the fifteen towns, and tally the opinions expressed by those who attend the meetings
Stratified random sampling
C) Randomly select one street in each town and contact each of the households on that street.
Cluster sampling (with undercoverage bias)
D) Go through the company’s customer records, selecting every 40th subscriber. Send employees to those homes to interview the people chosen.
Systematic random sampling (with response bias)
For Explanation on how this has been chosen, please refer the given link:
http://stattrek.com/survey-research/sampling-methods.aspx?Tutorial=AP
https://onlinecourses.science.psu.edu/stat100/node/18
Read about biases over here:
http://stattrek.com/survey-research/survey-bias.aspx