Short Answer and Computational Exercises 25. The NYPD needs to conduct a study on the average amount of tickets written each day to see if it is increasing from 2,500. A civilian in charge of the study ordered a Z test to be conducted using a sample of 20 recent days which revealed an average 2,600 and a standard deviation of 4. Why do you think this civilian was promptly fired? Note: Computations are not necessary to solve. 4 pts