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Determine selection and deliberate bias in a study.
The purposeful misrepresentation of data for the purpose of advancing an agenda.
A method of contacting people on the phone. Random numbers are dialed, so this allows researchers to sample people with unlisted phone numbers.
A bias that results from systematically excluding certain subsets of the population from the sample. It is not necessarily intentional.
Bias that is not purposeful. It exists because of errors in the design of the study.