A study carried out to investigate the relationship between a response variable relating to pressure drops in a screenplate bubble column and the predictors x1 = superficial fluid velocity, x2 = liquid viscosity, and x3 = opening mesh size resulted in the accompanying data ("A Correlation of Two-Phase Pressure Drops in Screen-Plate Bubble Column," Canad. J. of Chem. Engr., 1993: 460-463). The standardized residuals and hii values resulted from the model with just x1, x2, and x3 as predictors. Are there any unusual observations?

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