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STAT 3A03 Applied Regression With SASTerm Test 2 Solution SetQ. 1a)An outlier is a point which deviates from the linear model. Such a point can usually be seenfrom plots of the studentized residuals since it has a large studentized residual (in absolutevalue).[3 marks]b)Jackknifing involves deleting each observation in turn and refitting the model.[2 marks]