Answer:
Validity
Explanation:
In research, validity refers to whether the data and methodologies that are used in the research actually measures the things that the researchers are targeting.
From the case above, we can see that the searchers want to target Impulsive personality traits among adults but as it turn out the data that is taken is closer to sociable, outgoing, and fun adults (which is exactly the opposite of what';s the researchers are seeking for) Because of this, we can infer that the validity of the research is questionable.