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AP FAQs Which terms/concepts are often confused or used incorrectly by AP Psychology students when writing an essay about research methods? A common error is using random assignment and random sampling interchangeably. Random assignment is a procedure used in experiments to eliminate confounds by placing subjects into groups purely by chance. This attempts to ensure that the experimental and control groups have no significant differences other than the independent variable. Random sampling is used in surveys to attempt to ensure that each and every observation in a population has an equal chance of being included in the sample. -- Alan Feldman Contributors

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