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An example of voluntary response sample would be when a radio talk-show decides to run a call-in survey on a controversial topic, such as gun control. The most likely callers are going to be people with the strongest opinions, thus the sample that results from the survey is going to over-represent those very people.
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Are all voluntary response sample bad sample?
No they aren't.
Why is a voluntary response sample generally unsuitable for methods of statistic?
People with a special interest are more likely to respond, so the sample is likely to be biased.
Why is a voluntary response sample not suitable for a statistical study?
Voluntary response sample is not generally suitable for statistical study because its results are not likely to be the representative of the entire population under study.Such results could be biased as those who made effort to respond voluntary have strong feelings or opinions whether favorable or unfavorable regarding the subject of consideration.
What is a definition for voluntary response sample?
Voluntary response samples are things like mail-out surveys. The participants could choose to participate or not. This causes some forms of bias, because the only participants usually have strong opinions on the subject. People who care less are less likely to respond, leaving them out of the demographic.
What is volunteer sampling?
This is another way of saying self selected sample. This sampling technique consists of participants becoming part of a study because they volunteer when asked or in response to an advert. This technique, like opportunity sampling, is useful as it is quick and relatively easy to do. It can also reach a wide variety of participants. However, the type of participants who volunteer may not be representative of the target population for a number of reasons. For example, they may be more obedient, more motivated to take part in studies and so on. Suppose, for example, that a news show asks viewers to participate in an on-line poll. This would be a voluntary sample. The sample is chosen by the viewers, not by the survey administrator.
