Sampling Methods and Types of Bias

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What is Sampling?

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Sampling is the process of selecting a subset of individuals from a population to estimate characteristics of the whole population.

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What is a Representative Sample?

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A representative sample accurately reflects the characteristics of the population from which it is drawn.

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What is Random Sampling?

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Random sampling is a technique where each member of the population has an equal chance of being selected.

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What is Convenience Sampling?

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Convenience sampling involves selecting individuals who are easiest to reach, which may lead to bias.

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What is Stratified Sampling?

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Stratified sampling involves dividing the population into subgroups (strata) and taking a sample from each stratum.

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What is Undercoverage Bias?

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Undercoverage bias occurs when some groups in the population are left out of the selection process.

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What is Nonresponse Bias?

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Nonresponse bias occurs when individuals selected for the sample cannot be contacted or refuse to participate.

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What is Response Bias?

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Response bias occurs when respondents provide inaccurate answers due to various factors, such as misunderstanding the question.

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What is Voluntary Response Bias?

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Voluntary response bias occurs when individuals choose to participate in a survey, often leading to a non-representative sample.

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What is Systematic Random Sampling?

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Systematic random sampling involves selecting every nth individual from a list of the population.