Evaluating the influence of individual data points using a studentised deleted residual test is usually done with a one-tailed t-test.

Name: Evaluating the influence of individual data points using a studentised deleted residual test is usually done with a one-tailed t-test.
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The studentised deleted residual test typically involves a two-tailed t-test because it assesses the magnitude of a residual without assuming a direction of influence (positive or negative) on the model.

Evaluating the Influence of Individual Data Points Using a Studentised