AP Stats Unit 3 Review

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What is a representative sample?

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

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What are experimental units in a study?

Back

The individual subjects or items that are being studied or measured in an experiment.

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What is the purpose of blocking in an experiment?

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To create groups that are roughly equivalent at the beginning of an experiment, ensuring that the effects of uncontrolled variables are balanced among treatment groups.

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What is an observational study?

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A study where the researcher observes and records behavior without manipulating any variables.

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What is a stratified random sample?

Back

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

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What is random assignment in experiments?

Back

The process of randomly assigning participants to different treatment groups to ensure that each group is similar at the start of the experiment.

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What is a convenience sample?

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A sample that is taken from a group that is easily accessible, which may not represent the entire population.

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What is a cluster sample?

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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 the difference between a sample and a population?

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A population includes all members of a specified group, while a sample is a subset of the population.

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What is blinding in experiments?

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A technique where participants do not know whether they are receiving the treatment or a placebo to prevent bias.