This assignment involves testing the average abnormal returns of five good news firms, which are Computacenter plc, Playtech PLC, Clarksons PLC, Cairn Energy PLC, and TBC Bank Group PLC. The test is to compute the T-Test of Abnormal Return (T-Test) and check if it is significant or not. The data provided shows the abnormal returns for each firm over a period of five days, with some firms showing positive returns while others show negative returns. The assignment requires analysis of the data to determine if there are any significant differences in the average abnormal returns between the firms.