Psychology / Psych 0093 · Atom · ~20 seconds
What a Confound Costs
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A confound does not make a result false; it makes the result unreadable, because two explanations fit the same data equally well.
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The recall difference is real and could be produced by sleep, by time of day, or by both.
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Unreadable is worse than wrong. A wrong result can be corrected; an unreadable one has to be run again.
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