a. Inregression analysis, an outlier is an observation whose residual is much larger than the rest of the residual values.The residual is the difference between theobservedvalue of the dependent variable and the predicted value based on the regression model. Outliers are data points that deviate significantly from the overall pattern of the data and have large residuals compared to the other observations. They can have a substantial impact on the regression model, influencing the estimated coefficients and the overall fit of the model.Therefore, the correct answer is a. In regression analysis, anoutlieris an observation whose residual is much larger than the rest of the residual values.Learn more aboutregression analysisherebrainly.com/question/31873297#SPJ4Complete question is belowIn regression analysis, an outlier is an observation whose _____.a. residual is much larger than the rest of the residual valuesb. mean is larger than the standard deviationc. mean is 0d. residual is 0...

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