QUESTION 3 The average response time for customer support calls is 8 minutes. You suspect that implementing a new ticketing system can decrease the average response time. The null and alternative hypotheses for the population mean response time are formulated as follows: = HO: 8 Ha: <8 Which of the following are the valid rejection regions? O(-0,3) O (12,∞) ○ (0,8) O (4.11)