Using the Cook's Distance Statistic Dᵢ to Determine Influential Points

Multiple Choice

Using the Cook's distance statistic Dᵢ to determine influential points in a multiple regression model with k independent variable and n observations and letting Fᵥ₁ᵥ₂ denote the critical value of an F distribution with v₁ and v₂ degrees of freedom at a 0.50 level of significance, Xᵢ is an influential point if

A) Dᵢ < Fk₊₁,n₋k₋₁.
B) Dᵢ > Fk₊₁,n₋k₋₁.
C) Dᵢ < Fn₋k₋₁, k₊₁.
D) Dᵢ > Fn₋k₋₁, k₊₁.