A researcher published this survey result: "74% of people would be willing to spend 10% more for energy from a non-polluting source". The survey was conducted by posing the question on a national radio show and asking listeners to call in. 1,200 listeners responded. What is wrong with this survey?

Question

anonymous · Answer

Answers: 
        A. precise numbers
	B. correlation and causality
	C. voluntary response
	D. nonresponse

anonymous · Answer

@Spyro517

anonymous · Answer

I think this one is C because he allows people to call in, but only people who would pay 10% more would call, in my opinion, but I don't know.

spyro517 · Answer

I think its A since he said 74% and yet he gave an exact number.

anonymous · Answer

Ah, true. Alright. Thank you :).

spyro517 · Answer

btw how many do you have left?

anonymous · Answer

I've down a few, so maybe 10 or so.

spyro517 · Answer

alright

anonymous · Answer

10 exactly and 2 are just me double checking my answer.