Blinded experiment

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Blinded Experiment

A blinded experiment (pronounced: /ˈblaɪndɪd ɪkˈspɛrɪmənt/) is a method of scientific investigation in which the researchers, participants, or both are unaware of certain aspects of the experiment to prevent bias. The term originates from the phrase "blind to the facts," indicating a lack of awareness or understanding.

Etymology

The term "blinded" in this context is derived from the English word "blind," meaning unable to see. The term "experiment" comes from the Latin "experimentum," which means trial or test. The concept of a blinded experiment was first introduced in the 20th century to improve the validity of scientific research.

Types of Blinded Experiments

There are several types of blinded experiments, including:

  • Single-blind study: In a single-blind study, the participants do not know whether they are in the control group or the experimental group. This helps to prevent bias in their responses.
  • Double-blind study: In a double-blind study, both the participants and the researchers do not know who is in the control group and who is in the experimental group. This helps to prevent bias in both the participants' responses and the researchers' interpretation of the data.
  • Triple-blind study: In a triple-blind study, the participants, researchers, and the statisticians who analyze the data do not know who is in the control group and who is in the experimental group. This helps to prevent bias at all stages of the experiment.

Related Terms

  • Control group: A group in an experiment that does not receive the treatment or intervention and is used as a benchmark to measure how the other tested subjects do.
  • Bias: A systematic error in an experiment that can affect the results and conclusions.
  • Placebo: A substance or treatment that has no therapeutic effect, used as a control in testing new drugs.
  • Randomization: The process of randomly assigning subjects to different groups in an experiment.

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