The correct answer to the question is to report
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You take 800 times 22% so .22 and you get 176 move the decimal over one place and get 17.6$
The variable is the group that was given caffine, because thats what the doctors manipulated. They possibly altered the natural memory of the participants by giving them caffine. A more specific variable could be how much caffine each participant is given and what time are they given it.
