A psychologist develops a procedure for improving IQ scores by training subjects to become better at taking

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A psychologist develops a procedure for improving IQ scores by training subjects to become better at taking tests. A standard IQ test is used for evaluating the effectiveness of the procedure. In this case, is it necessary to take precautions against an experimenter effect? Why or why not?
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Statistical Reasoning for Everyday Life

ISBN: 978-0321817624

4th edition

Authors: Jeff Bennett, Bill Briggs, Mario F. Triola

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