Bilateral graphs represent two variables that are correlated. They allow the reader to see more than one set of data at once. The variables may overlap each other, however the map above does not show that. It represents Census data of total retail sales in the USA over the span on 11 days. The variable underneath that represents the total retail sales excluding the sale of gasoline. The resulting bilateral graph shows that as more money is spent in the retail sector of the economy, a directly proportional increase in gasoline sales results.
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