Question

Jorge is conducting an comparative experiment where he is comparing the heights of adults who grew up taking a certain vitamin and adults who did not. He finds that those who took vitamins are, on average, 2 cm taller. What is a major limitation of his experiment?

Large amounts of information can be gathered.
It is repeatable.
He can not show definitively that vitamins cause a person to be taller.
No relationship can be shown between vitamins and height.

Answer 1

The major limitation of Jorge's experiment is that he cannot definitively show that taking vitamins causes a person to be taller. There could be other factors that contribute to the difference in height between the two groups, such as genetics or lifestyle factors, that were not controlled for in the experiment. Without controlling for all relevant factors, it is not possible to establish a causal relationship between taking vitamins and being taller.