Stats Definitions and Methods of Sampling Review

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What is a sample?

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A sample is a small portion of the population used to gather data from.

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What is random sampling?

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Random sampling is a method where every individual in the population has an equal chance of being selected.

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Identify the population and sample: 45,000 people made credit card purchases, 1,000 surveys mailed, 137 returned.

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Population: 45,000 people who made credit card purchases. Sample: 137 returned surveys.

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Why do we randomly select our samples?

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To reduce bias.

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What is the mode in a data set?

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The mode is the number that occurs most often in a data set.

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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 convenience sampling?

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

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What is bias in sampling?

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Bias in sampling occurs when certain members of the population are more likely to be selected than others.

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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 is a survey?

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