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A Study Has Found a Positive Correlation Between Smoking Cigarettes

Question 137

Multiple Choice

A study has found a positive correlation between smoking cigarettes and schizophrenia. Which is/are possible explanations for this finding?


A) A third variable could be causing both.
B) Some property of nicotine could be part of the cause of schizophrenia.
C) Something about the nature of schizophrenia could be a factor in the cause of smoking.
D) All of the above are possible explanations for this finding.

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