Explain why this survey question might lead to an erroneous conclusion. ...

Explain why this survey question might lead to an erroneous conclusion. In an article in USA Weekend, this stamen was made: “More serious seems to be the coffee’s potential to raise blood pressure levels of homocysteine, a protein that promotes artery clogging. A recent Norwegian study found 20% higher homocysteine in heavy coffee drinkers (more than 9 cups a day) than in non-coffee drinkers. “Based on this statement, should we give up our daily cup of coffee?