Double Blind

Fourth, when a personal judgment is involved in the correlation, special doubleblind tests are required in the acquisition of data because the human desire to show something does (or doesn't) happen can affect the apparent outcome of a study. Such tests are designed to overcome biased psychological responses. Both the person giving the test and those taking the test (the double-blind feature) do not know whether the given object is a valid test item or an imitation. Statistical significance is then required of the true item, known from a secret list.

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