a. Explain why blinding is used in experiments. b. Explain why it is not always possible to make an experiment double-blind. You may refer to an example in the chapter if it makes it easier to explain.
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This bias can come from participants, researchers, or observers, and blinding helps ensure that the results are not skewed by this bias. ** Show more…
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Side effects. Even if an experiments is double-blind, the blinding might be compromised if side effects of the treatments differ. For example, suppose researchers at a skin-care company are comparing their new acne treatment against the leading competitor. Fifty subjects are assigned at random to each treatment, and the company's researchers will rate the improvement for each of the 100 subjects. The researchers aren't told which subjects received which treatments, but they know that their new acne treatment causes a slight reddening of the skin. How might this knowledge compromise the blinding? Explain why this is an important consideration in this experiment.
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Explain the difference between a single-blind and a double blind experiment.
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The Design of Experiments
A double-blind procedure is often used to prevent researchers' biases from influencing the outcome of an experiment. In this procedure a. only the participants know whether they are in the control group or the experimental group. b. experimental and control group members will be carefully matched for age, $\operatorname{sex},$ income, and education level. c. neither the participants nor the researchers know who is in the experimental group or control group. d. someone separate from the researcher will ask people to volunteer for the experimental group or the control group.
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