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37.5 BOD Parameter Estimation. The data below are duplicate measurements of the BOD of fresh
bovine manure. Use weighted nonlinear least squares to estimate the parameters in the model
η = θ 1 (1 − exp (−θ 2 t).

Day 1 3 5 7 10 15
BOD (mg/L) 11,320 20,730 28,000 32,000 35,200 33,000
11,720 22,320 29,600 33,600 32,000 36,600

Source: Marske, D. M. and L. B. Polkowski (1972). J. WPCF, 44, 1987–1992.

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