Experiment Design

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What is a completely randomized design?

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A completely randomized design is an experimental design where all subjects are randomly assigned to different treatment groups without any restrictions.

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What is a matched pairs experiment?

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A matched pairs experiment is a type of experimental design where subjects are paired based on certain characteristics, and each pair is assigned to different treatments.

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What is an explanatory variable (EV)?

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An explanatory variable (EV) is the variable that is manipulated or controlled in an experiment to observe its effect on the response variable.

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What is a response variable?

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A response variable is the outcome or effect that is measured in an experiment, which is expected to change in response to the explanatory variable.

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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 want to gather information.

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What is a sample in research?

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A sample is a subset of the population selected for observation and analysis.

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What is a census?

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A census is a study that attempts to collect data from every member of a population.

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What is stratified sampling?

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Stratified sampling is a method of sampling that involves dividing the population into subgroups (strata) and taking a sample from each stratum.

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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 assigned to any group, which minimizes bias and allows for causal inferences.

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What is the difference between an observational study and an experiment?

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An observational study involves observing subjects without manipulation, while an experiment involves manipulating one or more variables to determine their effect.