Unit 4 Review: Collecting Data

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What is a placebo?

Back

A treatment that has no active ingredient but is otherwise like other treatments.

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What is a completely randomized design?

Back

A design in which the experimental units are assigned to the treatments completely at random.

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What is the placebo effect?

Back

The phenomenon where some subjects in an experiment respond favorably to any treatment, even an inactive one.

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What are subjects in an experiment?

Back

Experimental units that are human beings.

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What is a single-blind experiment?

Back

An experiment in which either the subjects or the people who interact with them and measure the response don't know which treatment a subject is receiving.

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What is a control group?

Back

A group in an experiment that does not receive the treatment and is used for comparison.

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What is random assignment?

Back

The process of assigning experimental units to treatments using randomization.

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What is confounding in an experiment?

Back

A situation where the effects of two or more variables are not separated, making it difficult to determine the effect of each variable.

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What is a double-blind experiment?

Back

An experiment in which both the subjects and the experimenters do not know which treatment the subjects are receiving.

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What is bias in experimental design?

Back

A systematic error that leads to an incorrect estimate of the effect of a treatment.