Carlson's experiments dealt with biases in which of the following ways ?
A. The subjects and the scientists were not made aware of the personality profile results from both the astrologers and the CPI test
B. The astrologers were allowed to predict their own threshold of success prior to the experiment
C. Subjects were divided into control groups who were not given their true personality profile as a choice and a treatment group who were given their personality profile as a choice
D. Subjects were matched with individuals with the same sun sign before assignment to a control or a treatment group
E. All of the above
Answer: A. The subjects and the scientists were not made aware of the personality profile results from both the astrologers and the CPI test
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