In a study of store checkout scanning systems, samples of purchases were used to compare the scanned prices to the posted prices. The accompanying table summarizes results for a sample of 819 items. When stores use scanners to check out items, are the error rates the same for regular-priced items as they are for advertised-special items? How might the behavior of consumers change if they believe that disproportionately more overcharges occur with advertised-special items?

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Regular-Priced Items 20 15 384 Advertised-Special Items Undercharge Overcharge Correct price 29 364 Based on data from "UPC Scanner Pricing Systems: Are They Accurate?" by Ronald Goodstein, Journal of Marketing, Vol. 58.