Question: The accompanying scatterplot is based on data provided by authors of the article Spurious Correlation in the USEPA Rating Curve Method for Estimating Pollutant Loads

The accompanying scatterplot is based on data provided by authors of the article "Spurious Correlation in the USEPA Rating Curve Method for Estimating Pollutant Loads" (J. of Envir. Engr., 2008: 610-618); here discharge is in ft3/s as opposed to m3/s used in the article. The point on the far right of the plot corresponds to the observation (140, 1529.35). The resulting standardized residual is 3.10. Minitab flags the observation with an R for large residual and an X for potentially influential observation. Here is some information on the estimated slope:

Does this observation appear to have had a substantial impact on the estimated slope? Explain.

Full sample 9.9050 3806 (140. 1529.35) deleted B1 8.8241 -4734 1600 1400 1200 1000 Load--13.58+9.905 Discharge on 800- 600- nD 400 200 0 69.0107 R-Sq 92.5% R-Sq (adj) 92.4% 0 20 4060 80 100 120 140 Discharge (cfs)

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