16 4 Donal works in the head office of a large law firm. The law firm employs both qualified solicitors and ‘agents’ to resolve legal cases. Each legal case is assigned to an agent for one month to find out if it can be resolved easily. If not, the legal case has to be assigned to a solicitor. Donal is writing a report on the use of work targets for agents at the law firm. To collect data from his colleagues, he used the following sampling method. • Randomly select 3 of the law firm’s 10 offices. • Take a random sample of 20% of the agents from each of the 3 offices selected. Donal visited the 3 offices selected to collect detailed information from the agents in his sample. (a) Write down the name of Donal’s sampling method. (1) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ (b) For Donal’s sampling method write down (i) two advantages, (2) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________