The decline of water supplies in certain areas ofthe United States has created the need
Chapter 12, Problem 54(choose chapter or problem)
The decline of water supplies in certain areas ofthe United States has created the need for increasedunderstanding of relationships between economic factorssuch as crop yield and hydrologic and soil factors. Thearticle Variability of Soil Water Properties and CropYield in a Sloped Watershed (Water Resources Bull.,1988: 281288) gives data on grain sorghum yield (y, ing/m-row) and distance upslope (x, in m) on a slopingwatershed. Selected observations are given in the accompanyingtable.a. Construct a scatter plot. Does the simple linear regressionmodel appear to be plausible?b. Carry out a test of model utility.c. Estimate true average yield when distance upslope is 75by giving an interval of plausible values.
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