A researcher develops a questionnaire to assess impulsiveness among adults. in a journal article, she presents evidence that college students tend to get essentially the same score if they take the test twice, two months apart. however, when you look at the sample questionnaire items she included in the article, it seems to you that they relate more to whether a person is sociable, outgoing, and fun than to whether an individual is impulsive. you are specifically questioning the _____ of the researcher's questionnaire.