Identify the sampling designs that use voluntary response sampling. Check all that apply.A used car dealer surveys potential customers about the type of car they are interested in so he can plan his future inventory.A pharmaceutical company advertises for subjects to participate in an online survey about insulin pumps for diabetics.An online poll is created for sports fans to vote on the winner for the Super Bowl.Each employee is given a mandatory survey to complete about health benefits.A census taker randomly calls homes to gather data about household income and family demographics.After each customer service call, callers are asked to stay on the line to complete a brief satisfaction survey.
Answer
A
A used car dealer surveys potential customers about the type of car they are interested in so he can plan his future inventory.
B
A pharmaceutical company advertises for subjects to participate in an online survey about insulin pumps for diabetics.
C
An online poll is created for sports fans to vote on the winner for the Super Bowl.
D
Each employee is given a mandatory survey to complete about health benefits.
E
A census taker randomly calls homes to gather data about household income and family demographics.
F
After each customer service call, callers are asked to stay on the line to complete a brief satisfaction survey.
Explanation
Voluntary response sampling occurs when people choose for themselves whether to participate. The advertised survey about insulin pumps and the online Super Bowl poll rely on people who decide to respond. The customer-service satisfaction survey also qualifies because callers can choose whether to stay on the line; the mandatory employee survey and randomly selected phone calls do not use voluntary response sampling.
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