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Establishing Causal Links
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ability able ACE inhibitors agnosticism alcohol aspirin astrologer auxiliary assumptions biorhythm called causal experiments causal factors causal link cause chances Chapter childbed fever chiropractors conclude confirmation bias consider contain control group correct correlation crop circles difference in levels discover dowser dowsing evidence example exercises experimental and control experimental conditions experimental group experimental subject experimenter bias extraordinary claims fact fallacies Gay-Lussac's law happen heart attack Imagine involve level of effect lives look lung cancer matching medical doctors ment mysterious natural world novel explanation Occam's razor occur patients perimental person phenomenon phlogiston theory planets population proposed explanation prospective experiments pseudoscience psychic Ptolemy puzzling question randomized experiment ratio reason Redi's reported retrospective studies scientific method scientists seems Semmelweis sense skepticism smokers sort spontaneous human combustion statistically suggest Suppose suspected causal agent telekinesis telepathy theory things tion treatment wrong