2.4 An online survey. You go to a website to access a news story. In order to access the story, you are asked to answer a brief survey. If you choose not to answer the survey, you can only access the article for a fee.
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This method for obtaining a sample is an example of
(a) simple random sampling.
(b) random sampling, but not simple random sampling, because people visit the website at random.
(c) a convenience sample.
(d) a write-in opinion poll.