Fit the first-order model, E(y) = β0 + β1x1 + β2x2 + β3x3.

To the data, where y = DDT level (parts per million), x1 = number of miles upstream, x2 = length (centimeters), and x3 = weight (grams). Use the Excel/XLSTAT printout above to predict, with 90% confidence, the DDT level of a fish caught 300 miles upstream with a length of 40 centimeters and a weight of 1,000 grams. Interpret the result.
For Information: Refer to Exercise 12.18 and the U.S. Army Corps of Engineers study.

Transcribed Image Text:

Predictions for the new observations Pred(DDT) Lower bound 90% (Moan) Upper bound 90% (Mean) Lower bound 90% (Observation 143.2178 Upper bound 90% Observation. 80.9784 MILE-300, LNGTH-40. WT-1000 3.8650 33.8956