The article “Doctor Dogs Diagnose Cancer by Sniffing It Out” (Knight Ridder Newspapers, January 9, 2006) reports the results of an experiment described in the journal Integrative Cancer Therapies. In this experiment, dogs were trained to distinguish between people with breast and lung cancer and people without cancer by sniffing exhaled breath. Dogs were trained to lay down if they detected cancer in a breath sample. After training, dogs’ ability to detect cancer was tested using breath samples from people whose breath had not been used in training the dogs. The paper states “The researchers blinded both the dog handlers and the experimental observers to the identity of the breath samples.” Explain why this blinding is an important aspect of the design of this experiment.
Answer to relevant QuestionsAn experiment to evaluate whether vitamins can help prevent recurrence of blocked arteries in patients who have had surgery to clear blocked arteries was described in the article “Vitamins Found to Help Prevent Blocked ...A pollster for the Public Policy Institute of California explains how the Institute selects a sample of California adults (“It’s About Quality, Not Quantity,” San Luis Obispo Tribune, January 21, 2000): That is done by ...The article “Workers Grow More Dissatisfied” in the San Luis Obispo Tribune (August 22, 2002) states that “a survey of 5000 people found that while most Americans continue to find their jobs interesting, and are even ...Researchers at the Hospital for Sick Children in Toronto compared babies born to mothers with diabetes to babies born to mothers without diabetes (“Conditioning and Hyperanalgesia in Newborns Exposed to Repeated Heel ...An article that appeared in USA Today (August 11, 1998) described a study on prayer and blood pressure. In this study, 2391 people 65 years or older, were followed for 6 years. The article stated that people who attended a ...
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