x1 = sales 12 * profits 13 = assets Company (billions) (billions) (billions) Citigroup 108.28 17.05 1,484.10 General Electric 152.36 16.59 750.33 American In Group 95.04 10.91 766.42 Bank of America 65.45 14.14 1,110.46 HSBC Group 62.97 9.52 1.031.29 ExxonMobil 253.99 25.33 195.26 Royal Dutch/Shell 265.19 18.54 193.83 BP 285.06 15.73 191.11 ING Group 92.01 8.10 1,175.16 TOVOLA Motor 165.68 11.13 211.15 Prom www.Forbes.com partially based on Forbes The Forbes Global 2000, April 18, 2095. Problem 4.24 The above table contains data on the world's 10 largest companies as of April 2005. For sales (x] ) and profits (12) data: (a) Construct Q-Q plots. Do these data appear to be normally distributed? Ex- plain. (b) Carry out a test of normality based on the correlation coefficient ro. Set the significance level at a = 0.10. Do the results of these tests corroborate the results in (a)