Question: In an AOL survey of Internet users, this question was posted online: Have you ever been hit by a computer virus? Among the 170,063 responses,
In an AOL survey of Internet users, this question was posted online: “Have you ever been hit by a computer virus?” Among the 170,063 responses, 63% answered “yes.” What term is used to describe this type of survey in which the people surveyed consist of those who chose to respond? What is wrong with this type of sampling method?
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