A sociologist is interested in determining if those shopping at the mall tend to spend more money if they are with friends versus if they are shopping alone She interviews 8 shoppers who regularly shop at the mall, both alone and with friends, and inquires about the following two variables X=amount spent when they last shopped alone and X2 amount spent when they last shopped with their friends Below is the data she collected. Shopper X X2 35 72 10 15

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