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Sampling bias occurs when the sample selected for a study is not representative of the population, leading to inaccurate or misleading results.
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Nonresponse Bias: This refers to when individuals chosen for a study refuse to participate, leading to an unrepresentative sample.
Selection Bias: This occurs when certain groups are systematically excluded from the sample, skewing the results.
Volunteer Bias: Volunteer bias happens when individuals self-select to participate in a study, potentially introducing biases into the data.