one of the drawbacks of longitudinal studies of intelligence is that A. they are especially prone to the distortion of cohort effects B. people who are retested may show improved performance as a result of practice C. the biases of the experimenter are more likely to distort the results than is true or other research methods D. all of the above are true

one of the drawbacks of longitudinal studies of intelligence is that

A. they are especially prone to the distortion of cohort effects
B. people who are retested may show improved performance as a result of practice
C. the biases of the experimenter are more likely to distort the results than is true or other research methods
D. all of the above are true

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