Question

A study in the 1980s found a link between drinking coffee and increased risk of pancreatic cancer. This study failed to consider the fact that many heavy coffee drinkers are also smokers. Smoking, and not coffee, may have been what cause the increased risk of pancreatic cancer. In this example, smoking is______.
A.
Random Variation

B.
A Confounding Variable

C.
A Placebo

D.
An Epidemic Curve

Answer 1

Answer: A

Explanation: