T5.1 Sampling and 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 Bias in Sampling?

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Bias in sampling refers to systematic errors that lead to an inaccurate representation of the population.

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Define Voluntary Response Bias.

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Voluntary Response Bias occurs when individuals select themselves to participate in a survey, often leading to overrepresentation of strong opinions.

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What is Nonresponse Bias?

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Nonresponse Bias occurs when a significant number of selected individuals do not respond to the survey, potentially skewing results.

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Explain Undercoverage Bias.

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Undercoverage Bias happens when some members of the population are inadequately represented in the sample.

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What is Convenience Sampling?

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Convenience Sampling is a non-random sampling method where participants are selected based on their easy availability.

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Define 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 the Population in a survey?

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The population is the entire group of individuals that a researcher is interested in studying.

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What is a Sample?

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A sample is a subset of the population selected for the purpose of conducting a survey.

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What is a Survey?

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A survey is a method of collecting data from a predefined group, often using questionnaires.