Delta, United, and American Airlines announced purchases of planes on July 18 (7/18), February 12 (2/12), and October 7 (10/7), respectively. Delta United American MarketCompany MarketCompany MarketCompany Date Return Return Date Return Return Date Return Return 7/12 -.32 -.43 2/8 -.81 -1.02 10/1 .52 .29 7/13 .00 .22 2/9 -.91 -1.02 10/2 42 .63 7/16 .51 .73 2/10 .42 .20 10/3 1.12 1.12 7/17 -.51 -29 2/11 .62 1.21 10/6 .12 -.69 7/18 -2.11 1.23 2/12 -32 -.09 10/7 -2.22 -.30 7/19 -.86 -.64 2/15 1.12 1.43 10/8 .52 .52 7/20 -.91 -1.03 2/16 .52 .52 10/9 -.32 7/23 .72 49 2/17 -.32 -20 10/10 .32 -.10 7/24 .22 .11 2/18 32 .19 10/13 .00 -12 - 20 Given the above information, calculate the cumulative abnormal return (CAR) for these stocks as a group. All of the stocks have a beta of 1 and no other announcements are made. (A negative answer should be indicated by a minus sign. Leave no cells blank - be certain to enter "0" wherever required. Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) Abnormal returns (Ri - RM) Days from announcement Delta United American Sum Average abnormal return Cumulative abnormal return -4 -3 -2 -1 0 1 2 3 4