In a study of variables that affect productivity in the retail grocery trade, W.S. Good uses value added per work-hour to measure the productivity of retail grocery outlets. He defines "value added" as "the surplus [money generated by the business] available to pay for labour, furniture and fixtures, and equipment." Data consistent with the relationship between value added per work-hour Y and the size x of a grocery outlet described in Good's article are shown in Table 13.2 for 10 fictitious grocery outlets. Choose a model to relate Y to x.

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Data on Store Size and Value Added Store Value Added per Work-Hour, y Size of Store (thousand square metres), x -23456 S $4.08 1.95 3.40 1.11 3.51 2.34 3.09 0.97 2.92 2.87 1.94 0.63 7 4.11 1.82 8 3.16 1.34 9 3.75 2.32 10 3.60 1.77