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
Date	Market Return	Company Return	Date	Market Return	Company Return	Date	Market Return	Company Return
7/12	.35	.49	2/8	.84	1.08	10/1	.55	.26
7/13	.00	.25	2/9	.94	1.08	10/2	.45	.69
7/16	.57	.85	2/10	.45	.17	10/3	1.15	1.15
7/17	.57	.29	2/11	.65	1.90	10/6	.15	1.38
7/18	2.14	1.26	2/12	.35	.06	10/7	2.25	.27
7/19	.89	.61	2/15	1.15	1.85	10/8	.55	.55
7/20	.94	1.12	2/16	.55	.55	10/9	.35	.17
7/23	.75	.46	2/17	.35	.17	10/10	.35	.07
7/24	.25	.08	2/18	.35	.16	10/13	.00	.15

Given the above information, calculate the cumulative abnormal return (CAR) for these stocks as a group. (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