1. For each part below, CIRCLE the ONE BEST answer. [1 pt each] (a) A scale-loca

Question

1. For each part below, CIRCLE the ONE BEST answer. [1 pt each] (a) A scale-location plot is intended to diagnose curvature in the mean heteroscedastici ty both neither b) Variance inflation factors are computed from the dependent variable the independent variables both neither (c) Generalized least squares is a special case of weighted least squares ordinary least squaresnone of these measurement error (d) A lack-of-fit test requires the data to have replications when pure error is zero pure error is positive 2 is known 2 is unknown (e) In regression, a prediction interval is usually designed to contain a new value of (f) In the usual regression model y +e, the (ordinary) least squares predicted values vector f equals (g) A Cook's distance is a function of the (internally) standardized residual leverage both neither (h) Under the Gauss-Markov conditions, the (ordinary) least squares estimator of cTB has smallest variance among all estimators is unbiased both of these neither of these

Explanation / Answer

a. heteroscedasticity.

b. the independent variables

c. none of these(GLS is used when OLS and WLS seems inefficient)

d. pure error is positive

e. Y

f. 3rd option

g. leverage

h. both of these

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