Question: =+had consumed during the previous week. A year later (after liquor stores started accepting credit cards for purchases), these same individuals were again asked how

=+had consumed during the previous week. A year later (after liquor stores started accepting credit cards for purchases), these same individuals were again asked how many drinks they had consumed in the previous week.

The data shown are consistent with summary statistics presented in the article.

1994 1995 n Mean Mean sd Credit-Card Shoppers 96 6.72 6.34 .38 5.52 Non-Credit Card Shoppers 850 4.09 3.97 .12 4.58

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