Professor Johnston has found a strong positive correlation between wearing neckt

Question

Professor Johnston has found a strong positive correlation between wearing neckties and the frequency of strokes (r= 0.89). He thinks that the necktie reduce blood flow to the brain, preventing the brain from receiving enough oxygen. Professor Johnston and his associates claim to have proven that wearing neckties causes strokes. What error has Professor Johnston made? A. An r= 0.89 is not a very large r-value. B. Professor Johnston is drawing a causal conclusion from correlational findings. C. Not everyone who wears a necktie wears it very tight. D. Professor Johnston should know that there are other ways for blood to reach 6. the brain.

Explanation / Answer

A correlation between variables, however, does not automatically mean that the change in one variable is the cause of the change in the values of the other variable.Causation indicates that one event is the result of the occurrence of the other event; i.e. there is a causal relationship between the two events.

Here correlation is between wearing neckties and the frequency of strokes (r=0.89)

Based on this professor conclude that wearing neckties causes strokes. Hence made the error.

Hence answer is B. Professor Johnston is drawing a causal conclusion from correlational findings.

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