An article in a 2006 issue of the Journal of Behavioral Decision Making reports on a study involving 47 undergraduate students at Harvard. All of the participants were given $50, but some (chosen at random) were told that this was a "tuition rebate," while the others were told that this was "bonus income." After one week, the students were contacted again and asked how much of the $50 they had spent and how much they had saved. Researchers wanted to know whether those receiving the "rebate" would tend to save more money than those receiving the "bonus." What are the observational units in this scenario? one week O amount of bonus O $50 O 47 students eTextbook and Media What are the variables in this scenario? O what the students spent the money on the number of students participating how long it took the student to spend the bonus what the student was told how much money each student spent