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The Practice of Statistics | 5th Edition | ISBN: 9781464108730 | Authors: Daren S. Starnes, Josh Tabor
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Random assignment is part of a well-designed comparative experiment because (a) it is

Chapter 12, Problem AP4.20

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QUESTION:

Random assignment is part of a well-designed comparative experiment because (a) it is more fair to the subjects. (b) it helps create roughly equivalent groups before treatments are imposed on the subjects. (c) it allows researchers to generalize the results of their experiment to a larger population. (d) it helps eliminate any possibility of bias in the experiment. (e) it prevents the placebo effect from occurring. AP4

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QUESTION:

Random assignment is part of a well-designed comparative experiment because (a) it is more fair to the subjects. (b) it helps create roughly equivalent groups before treatments are imposed on the subjects. (c) it allows researchers to generalize the results of their experiment to a larger population. (d) it helps eliminate any possibility of bias in the experiment. (e) it prevents the placebo effect from occurring. AP4

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We use random assignment in a well-designed comparative experiment, because we want the different treatment groups to be as similar as possible such that there are no differences among the treatment groups before the treatment and thus we can then be sure that the differences are due to the treatments themselves.

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