You turn your web browser to the online Harris Interactive Poll. Based on 2234 r

Question

You turn your web browser to the online Harris Interactive Poll. Based on 2234 responses, the poll reports that 45% of U.S. adults believe global climate change exists and humans are the main cause, 30% believe global climate change exists but that its causes are mainly not related to humans, 13% do not believe global climate change exists, and 12% are undecided. You should refuse to calculate a 95% confidence interval for the proportion of all U.S. adults who do not believe global climate change exists based on this sample because

A. the sample is too large.

B. this percent is too small.

C. inference from a voluntary response sample can’t be trusted.

Explanation / Answer

[ANSWER] C. inference from a voluntary response sample can’t be trusted.

is correct because this voluntary response sample collects only the opinions of those who visit this site and feel strongly enough to respond.

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