The accompanying scatter plot 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:

Ful