Population, Samples & Types of Studies

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What is a sample in research?

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A sample is a part of a group being surveyed.

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What is a population in research?

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

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CCSS.HSS.IC.A.1

CCSS.7.SP.A.1

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What is a random sample?

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A random sample is a subset of a population in which each member has an equal chance of being selected.

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CCSS.HSS.IC.B.3

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What is an observational study?

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An observational study is a type of research where the researcher observes and records behavior without manipulating any variables.

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CCSS.HSS.IC.B.3

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What is an experiment in research?

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An experiment is a study in which the researcher manipulates one or more variables to determine their effect on another variable.

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What is a representative sample?

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A representative sample accurately reflects the characteristics of the population from which it is drawn.

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CCSS.HSS.IC.A.1

CCSS.7.SP.A.1

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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, while a population includes all members of a specified group.

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CCSS.HSS.IC.A.1

CCSS.7.SP.A.1

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What is the purpose of random assignment in experiments?

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Random assignment helps ensure that each participant has an equal chance of being placed in any group, reducing bias.

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What is the significance of control groups in experiments?

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Control groups are used to compare against experimental groups to determine the effect of the independent variable.

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What is a survey in research?

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