question 4.6

Content X Bb 10325380 X notes-resources x 5 Regression Analy X olo How to Perform | X Ali Hadi Website X *Course Hero X + X C cloudflare-ipfs.com/ipfs/bafykbzacecfy3zxlxioerfdhsuyhslgdzdrms7ai5psmvze5g4xzxyz6e2qk?filename=Samprit%20Chatterjee%20%20Ali%205.%20Hadi%.. G Error E Regression Analysis by Example 143 / 421 | 157% + (f) The observations are equally influential on least squares results. 4.6 The following graphs are used to verify some of the assumptions of the ordinary least squares regression of Y on X1, X2, . . ., Xp: 1. The scatter plot of Y versus each predictor Xj. 2. The scatter plot matrix of the variables X1, X2, . . . , Xp. 141 3. The normal probability plot of the internally standardized residuals. 4. The residuals versus fitted values. 5. The potential-residual plot. 6. Index plot of Cook's distance. 7. Index plot of Hadi's influence measure. For each of these graphs: 142 (a) What assumption can be verified by the graph? (b) Draw an example of the graph where the assumption does not seem to be violated. (c) Draw an example of the graph which indicates the violation of the as- sumption. 4.7 Consider again the Cigarette Consumption data described in Exercise 3.15 and given in Table 3.17. 143 Type here to search O S 03:06 PM 58"F Cloudy ~D() ENG 16-10-2021