When comparing the body mass index (BMI) of obese women in two cities, John found that the average BMI of City A was higher than that of City B. However, when he concluded that a woman in City A will have a higher BMI than a woman in City B, his conclusion was an example of ______________.
A)An odds ratio.
B)An ecological fallacy.
C)A causality.
D)A relative risk.

Question

Quizplus · Accepted Answer

John's conclusion is an example of an ecological fallacy, which occurs when assumptions about individuals are made based on aggregate data for a group. Just because the average BMI is higher in City A does not mean every individual woman in City A has a higher BMI than every woman in City B.

When Comparing the Body Mass Index (BMI) of Obese Women