Having Obtained a Scatterplot to Inspect the Data, You Suspect

Multiple Choice

Having obtained a scatterplot to inspect the data, you suspect that the results for participants 4 and 17 are outliers. What should you do?

A) Remove the cases so that the model is more representative of the majority of observations.
B) Perform a series of diagnostic tests on the data such as Cook's distance or Mahalanobis distance.
C) Leave the data points in and incorporate the Fick reducer variable.
D) Rerun the analysis without the observations in to see how the regression model is affected.