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 -.31 -.41 2/8 -.80 -1.00 10/1 .51 .31 7/13 .00 .21 2/9 -.90 -1.00 10/2 .41 .61 7/16 .51 .71 2/10 .41 .21 10/3 1.11 1.11 7/17 -.51 -.31 2/11 .61 1.00 10/6 .11 -.48 7/18 -2.10 1.21 2/12 -.31 -.10 10/7 -2.21 -.31 7/19 -.85 -.65 2/15 1.11 1.31 10/8 .51 .51 7/20 -.90 -1.00 2/16 .51 .51 10/9 -.31 -.21 7/23 .71 .51 2/17 -.31 -.21 10/10 .31 -.11 7/24 .11 2/18 .20 10/13 .00 -.11 .21 .31 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