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What is a sample in statistics?

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

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What is the difference between a population and a sample?

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A population includes all members of a specified group, while a sample is a smaller group selected from the population.

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What is simple random sampling?

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A sampling method where every member of the population has an equal chance of being selected.

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What is systematic sampling?

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A sampling method where members are selected at regular intervals from a randomly ordered list.

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What is cluster sampling?

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A sampling method where the population is divided into clusters, and entire clusters are randomly selected.

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What is stratified sampling?

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

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What is convenience sampling?

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A sampling method where samples are taken from a group that is easily accessible.

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What is the purpose of sampling in statistics?

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To make inferences about a population without having to study the entire group.

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What is bias in sampling?

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Bias occurs when certain members of the population are more likely to be selected than others, leading to an unrepresentative sample.

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What is a sampling frame?

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A list or database from which a sample is drawn.