The Institute of Psychiatry at Kings College London found that dealing with “infomania” has a temporary, but significant derogatory effect on IQ (Discover, November 2005). In this experiment, researchers divided volunteers into two groups. Each subject took an IQ test. One group had to check e-mail and respond to instant messages while taking the test, and the second group took the test without any distraction. The distracted group had an average score that was 10 points lower than the average for the control group. Explain why it is important that the researchers created the two experimental groups in this study by using random assignment.
Answer to relevant QuestionsIn an experiment to compare two different surgical procedures for hernia repair (“A Single-Blinded, Randomized Comparison of Laparoscopic Versus Open Hernia Repair in Children,” Pediatrics : 332– 336), 89 ...Construct a diagram to represent the subliminal messages experiment of Example 2.5. Explain why blinding is a reasonable strategy in many experiments. Pismo Beach, California, has an annual clam festival that includes a clam chowder contest. Judges rate clam chowders from local restaurants, and the judging is done in such a way that the judges are not aware of which ...A study of more than 50,000 U.S. nurses found that those who drank just one soda or fruit punch a day tended to gain much more weight and had an 80% increased risk in developing diabetes compared to those who drank less than ...
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