Case: A small convenience store chain is interested in modeling the weekly sales of a store, y, as a function of the weekly traffic flow on the street where the store is located. The table below contains data collected from 20 stores in the chain. Store Traffic Flow Weekly Sales (S (thousands of cars) thousands) 59.3 6.3 2 60.3 6.6 3 82.1 7.6 32.3 3.0 5 98 9.5 6 52.1 5.9 54.4 6.1 51.3 5.0 36.7 3.6 23.6 2.8 11 57.6 6.7 12 40.6 5.2 13 75.8 8.2 14 48.3 5 15 41.4 3.9 16 62.5 5.4 17 44.0 4.1 18 29.6 3.1 19 49.5 5.4 20 73.1 8.4