Experimental Design

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What is a response variable?

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A variable whose values are compared across different treatments in an experiment.

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What is a treatment in experimental design?

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The process or controlled circumstance applied to randomly assigned experimental units, within different levels of a single factor or a combination of levels of 2 or more factors.

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What is a completely randomized design?

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A design where objects or subjects are assigned to groups completely at random.

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What is random assignment in experiments?

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The process of assigning experimental units to different groups in a way that each unit has an equal chance of being assigned to any group, ensuring validity.

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What is an observational study?

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A study based on data in which no manipulation of factors has been employed.

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What is a factor in experimental design?

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A variable that is manipulated in an experiment to observe its effect on the response variable.

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What is a control group?

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A group in an experiment that does not receive the treatment and is used as a benchmark to measure how the other tested subjects do.

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What is the placebo effect?

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A phenomenon where participants experience a perceived improvement in condition due to believing they are receiving treatment, even if they are not.

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What is a subject in an experiment?

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An individual or unit that is being studied or tested in an experiment.

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What is a completely blocked design?

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An experimental design where subjects are divided into blocks based on a certain characteristic, and treatments are randomly assigned within each block.