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Critical Reasoning
Directions: Read the following passage/information and answer the question that follows.
Researchers who conducted a one-year study found that one marijuana cigarette deposits four times more tar in a smoker’s lungs than does one tobacco cigarette. The researchers concluded that marijuana smokers are more likely to suffer from tar–induced lung cancer than are tobacco smokers.
Which of the following statements, if true, would most seriously weaken the researchers' conclusion described above?
This is a case of conclusions arrived at on the basis of inappropriate data. When one type of cigarette is being branded more injurious than the other, we have to ask whether the two samples were indeed representative. This leads us to (3).