You are performing a test of controls over sales during the audit of Car Parts Pty Ltd (Car Parts), a wholesaler of vehicle spare parts. The audit junior on your team has made the following note on the working papers. "Before goods are shipped, the Warehouse Manager checks the information on the Shipping Order to make sure that it is correct. If it is, he initials the Shipping Order. Shipping Orders are prenumbered. The number of the first Shipping Order used in this financial year was # 2163001, and number of the last one used was # 2163600." The Audit Manager asked you to select 50 Shipping Orders from the file in the Warehouse to determine whether or not the Warehouse Manager had initialled them. He said that, in his experience, 50 was a suitable number to test. He said that the first Shipping Order to select should be # 2163432, with subsequent Shipping Orders selected at intervals of 12. You selected the 50 Shipping Orders. Required: Answer the following questions: (1) What is the population of interest in this audit? (2) What is the size of the population? (3) What is the sampling unit? (4) What is the method of sample selection? (5) Has variables sampling or attribute sampling been used? (6) When examining the Shipping Orders, you find that, on some, the writing has faded and you have difficulty determining whether or not they had been initialed. Your colleague tells you not to worry about it because that is just sampling risk. Is your colleague's statement true or false? X