rindwell, Inc., a manufacturer of grinding tools, is con- cerned about the durability of its products, which de- pends on the permeability of the sinter mixtures used in production. Suspecting that the carbon content might be the source of the problem, the plant manager collected the following data: Carbon Content (%) Permeability Index 5.5 16 3.0 31 4.5 21 4.8 19 4.2 16 4.7 23 5.1 20 4.4 11 3.6 20 Draw a scatter diagram for these data.