Sampling Methods and Types of Bias

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What is a population in statistics?

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A population is a large group that includes everything being studied.

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What is a systematic sample?

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A systematic sample is a type of sampling method where every nth individual is selected from a list or sequence.

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Why is random selection important in sampling?

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Random selection is important to reduce bias in the sample.

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What is voluntary response bias?

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Voluntary response bias occurs when individuals select themselves to be part of the sample, often leading to skewed results.

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What is a simple random sample?

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A simple random sample is a sampling method where every individual has an equal chance of being selected.

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What is the difference between a sample and a population?

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A sample is a subset of a population used to represent the whole group.

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What is undercoverage bias?

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Undercoverage bias occurs when some members of the population are inadequately represented in the sample.

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What is nonresponse bias?

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Nonresponse bias occurs when individuals selected for the sample do not respond, leading to potential skewing of results.

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What is stratified sampling?

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Stratified sampling is a method where the population is divided into subgroups (strata) and random samples are taken from each stratum.

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What is convenience sampling?

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Convenience sampling is a non-random sampling method where samples are taken from a group that is easily accessible.