The following data on annual sediment load in the Colorado River at the Grand Canyon have been recorded (in millions of tons) 49, 50, 50, 66, 70, 75, 84, 85, 98, 118, 122, 135, 143, 146, 157, 172, 177, 190, 225, 235, 265, 270, 400, 480.
(a) Plot this data on lognormal probability paper and use a straight-line fit by eye to estimate the parameters.
(b) Does the model pass a Kolmogorov-Smirnov goodness-of-fit test at the 10 percent level of significance?