Question

(b) Cook's Distance (a) Normal Q-Q Plot o' 1.1 2 4 6810 1.5 id Theoretical Quantiles Figure 1: Diagnostic Plots for the Shipping Cost Data: (a) Q-Q plot of the studentized jackknife residuals re-i): (b) Plot of Cook's Distance. (c) The following questions are related to outlier detection. Answer each with appropriate i. Which observation is most outlying in terms of its predictor values? Does it make it i. Which observation is the hardest to predict? Does it seem to make it to your outlier justification to your outlier list? list? ii. Which observation is the most influential one?

Answer 1

(c) (i) fifth observations is outlying as its cook'D distance is highest , it can be in the outlier list

(ii) 6th observation , its cook'D is large and out of the diagonal line on the Q-Q plot. This may come also in the outlier list.

(iii) first observations is most influential as it is entirely out of the diagonal line of the Q-Q plot