Chapman [1997-98] conducted an experiment using accelerated life testing to determine the estimated shelf life of a photographic developer. The data follow. Lifetimes often follow an exponential distribution. This company has found that the maximum density is a good indicator of overall developer/ film performance; correspondingly using generalized linear models. Perform appropriate residual analysis of your final model.

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1 (h) Dmax (72C) 1 (h) Dmax (82C) 1 (h) Dmax (92C) 72 3.55 48 3.52 24 3.46 144 3.27 96 3.35 48 2.91 216 2.89 144 2.50 72 2.27 288 2.55 192 2.10 96 1.49 360 2.34 240 1.90 120 1.20 432 2.14 288 1.47 144 1.04 504 1.77 336 1.19 168 0.65