Four different formulations of an industrial glue are being tested. The tensile strength of the glue when it is applied to join parts is also related to the application thickness. Five observations on strength (y) in pounds and thickness (x) in 0.01 inches are obtained for each formulation. The data are shown in the following table. Analyze these data and draw appropriate conclusions.

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Glue Formulation 1 2 3 4 y y y y 46.5 13 48.7 12 46.3 15 44.7 16 45.9 14 49.0 10 47.1 14 43.0 15 49.8 12 50.1 11 48.9 11 51.0 10 46.1 12 48.5 12 48.2 11 48.1 12 44.3 14 45.2 14 50.3 10 48.6 11