Samples and Populations

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What is a random sample?

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A random sample is a subset of individuals chosen from a larger population where each individual has an equal chance of being selected.

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What is a biased sample?

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A biased sample is a subset of individuals that does not accurately represent the larger population, often due to a flawed selection process.

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What is a sample in statistics?

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A sample is a part of a group being surveyed, used to make inferences about the entire population.

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What is a population in statistics?

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A population is the entire group of individuals or instances about whom we hope to learn.

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What does it mean for a study to be unbiased?

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A study is unbiased if the sample accurately represents the population, allowing for valid conclusions.

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What is the difference between a sample and a population?

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A sample is a smaller group selected from a population, which is the entire group of interest.

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What is a convenience sample?

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A convenience sample is a type of non-random sample that is taken from a group that is easy to reach.

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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 systematic sampling?

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Systematic sampling is a method where you select every nth individual from a list of the population.

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What is a survey?

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A survey is a method of collecting data by asking questions to a group of people.