The article “Behavioural Effects of Mobile Telephone Use During Simulated Driving” (Ergonomics, 1995: 2536–2562) reported that for a sample of 20 experimental subjects, the sample correlation coefficient for x = age and y = time since the subject had acquired a driving license (yr) was .97. Why do you think the value of r is so close to 1? (The article’s authors give an explanation.)
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