identify the sampling designs that use volunt...
identify the sampling designs that use voluntary response sampling. check all that apply.\na used - car dealer surveys potential customers about the type of car they are interested in so he can plan his future inventory.\na pharmaceutical company advertises for subjects to participate in an online survey about insulin pumps for diabetics.\nan online poll is created for sports fans to vote on the winner for the super bowl.\neach employee is given a mandatory survey to complete.\na census taker randomly calls homes to gather data about household income and family demographics.\nafter each customer - service call, callers are asked to stay on the line to complete a brief satisfaction survey.
Answer
# Brief Explanations:
Voluntary - response sampling is when individuals choose on their own to participate in a survey. In the given scenarios:
- A used - car dealer surveying potential customers is not voluntary response as it's likely a targeted approach, not self - selected.
- A pharmaceutical company advertising for subjects to participate in an online survey means people choose to respond, so it's voluntary response.
- An online poll for sports fans to vote is self - selected by those who choose to vote, so it's voluntary response.
- A mandatory survey for employees is not voluntary.
- A census taker randomly calling homes is not voluntary response as it's a random selection, not self - selection.
- Callers being asked to stay on the line after a customer service call is not truly voluntary as there is some pressure due to the call context.
# Answer:
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.