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 QSR 50. Perform a simple regression analysis to predict a restaurant chain’s sales by its number of units. How strong is the relationship?

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Chain McDonald's Starbucks Subway Burger King Taco Bell Wendy's Domino's Pizza Pizza Hut KFC Dairy Queen Sales ($ billions) 37.48 13.17 10.80 10.03 9.79 9.29 5.90 5.51 4.42 3.64 Number of Units (thousands) 15.0 13.9 25.9 7.2 6.4 5.8 5.6 7.5 4.1 4.5