5.14 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.

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