When a stepwise procedure is used, a variable selected at an earlier step can be removed from the model if, in the presence of other variables, it no longer contributes significantly to explaining the variation in the dependent variable y.

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This statement is true. In a stepwise procedure, variables are added or removed from the model based on their statistical significance in explaining the variation in the dependent variable. A variable selected at an earlier step may be removed if it no longer contributes significantly to the model when other variables are included.

When a Stepwise Procedure Is Used, a Variable Selected at an Earlier