Posted by jessica on Wednesday, August 5, 2009 at 10:19pm.
Suppose that a newspaper published the following in a
boxed corner of the want ads section:
Should handgun control be abolished? You can call the shots if
you participate in our poll tonight. If yes, call 1900ForGuns.
If no, call 1900BanGuns. You will be charged 50ยข for the
first minute.
Why will the results of this poll be biased?

math  MathMate, Wednesday, August 5, 2009 at 10:28pm
Do you see any 'filtering' process that might affect the sampling of the population?

math  jessica, Wednesday, August 5, 2009 at 10:35pm
not sure what u mean

math  MathMate, Wednesday, August 5, 2009 at 10:51pm
If a poll should be unbiased, the sampling process should either be completely random, or efforts made to ensure that the sample represents the population in terms of demography, etc.
If you examine the sampling mechanism, do you see any group of people would be more likely to be sampled than others?
Notice where the ad was placed,
the language,
other conditions to respond to the poll, etc.
In nonunilingual countries, the language barrier can be overcome by employing multilingual peronnel to do phone polling or interviewing.
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