7. Based on the above model fit, which if any of the Gauss-Markov assumptions ap

7) Answer: C That is, constant error variance. 8) Answer: B That is, Slope parameter estimates are biased.

ID: 3227005 • Letter: 7

Question

7. Based on the above model fit, which if any of the Gauss-Markov assumptions appears to be violated?

a. No error autocorrelation

b. Correct model is not linear

c. Constant error variance

d. Errors not normally distributed

e. None of these / cannot say

8. What is the likely consequence of the Gauss-Markov violation in Question 7?

a. Standard errors and confidence intervals are incorrect

b. Slope parameter estimates are biased

c. The F-statistic is inflated

d. Prediction intervals will converge toward having zero width

e. None of these / cannot say

ggplot Gdf aes(x,y)) geom point C) geom smooth Cmethod-"lin") 0.75 0.00 0.25 0.50 1.00

Answer: C

That is, constant error variance.

Answer: B

That is, Slope parameter estimates are biased.

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