Question 2 - 25 Marks Waste is an important factor to monitor in many manufacturing processes. When the variability of material used in a process is too high, engineers often must make changes to the process to avoid expensive wastage. An anti-rust spray uses a liquid that is sprayed on all surfaces of a certain type of racing car, and the amount used on each car was determined to be a normally distributed random variable. You recorded the fluid amount sprayed on each car of a randomly selected sample of 50 cars to have a sample mean 5: :12!) fluid ounces and a sample standard deviation of S: 7 fluid ounces. 3} Test the hypothesis that the true mean of sprayed amount Ha: ,u = 120 versus: H1: ,u