Question

Having obtained a scatterplot to inspect the data, you suspect that the results for participants 4...

Having obtained a scatterplot to inspect the data, you suspect that the results for participants 4 and 17 are outliers. What should you do?
Perform a series of diagnostic tests on the data such as Cook’s distance or Mahalanobis distance.
Remove the cases so that the model is more representative of the majority of observations.
Leave the data points in.
Rerun the analysis without the observations in to see how the regression model is affected.
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Rerun the analysis without the observations in to see how the regression model is affected.

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