Correlation is not necessarily causation.

A lot of science stories reported in he media confuse correlation with causation. Here is a typical example about sexism:

http://news.bbc.co.uk/1/hi/health/7625173.stm

The article says that men who exhibit sexist attitudes are more likely to earn more.

Alternative explanation, in couples were the man is earning more, it would be more likely for the women to stay home?

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