A researcher hypothesizes that wearing name tags leads to greater jobsatisfaction.Thus,heasks assigns third floor workers in a building to wear name tags for a week and, then, measures job satisfaction in workers from the second floor and third floor.He finds support for his hypothesis; however, the third floor workers (who wore name tags) work in teams and know one another and the second floor workers (who did not wear name tags) they work alone/ in do not know one another.Subsequent research finds that it is feelings of social connectedness at work that lead to the greatest employment satisfaction.

In the study described above, social connectedness is a potential _____ to the establishment of causality because the researcher did not use randomization.Had he used random assignment, he would have been able to "balance" the effects of social connectedness as well as many other variables making social connectednessan _______ variable.

confound;dependent

extraneous;confound

extraneous;dependent

confound;extraneous