Your colleague conducted a study to examine the rate of coronaryheart disease in the capital cities of the world relating to theaverage income. Results showed that, within the cities studied,coronary heart disease is higher in the richer cities than in thepoorer ones.  Your colleague concludesthat being rich increases your risk of heartdisease.  What is the problem withdrawing such a conclusion from this type of study (hint: thinkabout the study design)? How this problem is called?

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