It seems logical that restaurant chains with more units (restaurants) would have greater sales. This assumption is mitigated, however, by several possibilities: some units may be more profitable than others, some units may be larger, some units may serve more meals, some units may serve more expensive meals, and so on. The data shown here were published by Technomic. Perform a simple regression analysis to predict a restaurant chain's sales by its number of units. How strong is therelationship?

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Number of Units Chain McDonald's Burger King Taco Bell Pizza Hut Wendy's KFC Subway Dairy Queen Hardee's Sales $ billions) 17.1 7.9 4.8 4.7 4.6 4.0 2.9 2.7 2.7 (1000) 12.4 7.5 6.8 8.7 4.6 11.2 2.9