Cadmium. The data below are influent and effluent cadmium at a wastewater treatment plant. Use graphical and smoothing methods to interpret the data. Time runs from left to right. Inf. Cd (µg/L) 2.5 2.3 2.5 2.8 2.8 2.5 2.0 1.8 1.8 2.5 3.0 Eff. Cd (g/l) 0.8 1.0 1.3 0.0 0.5 0.0 0.0 Inf. Cd (pg/L) 2.0 Eff. Cd (pg/L) 0.3 0.0 1.0 1.0 0.3 NA 2.0 2.0 2.5 4.5 2.0 0.5 0.3 1.3 93 0.3 15 1.5 10.0 8.8 8.8 0.8 10.5 9.0 10.0 12.5 8.5 6.8 2.5 0.0 8.0 7.8

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