I ne officer groups the batches made in a month into which shift they are made. The number of defective items is counted in randomly selected batches in each shift. The officer takes the first 10 batches and counts the number of defective items. 1. simple random sample The officer chooses every 2. stratified sample 15th batch off the line and counts the number of defective items in each 3. systematic sample chosen batch. The officer lists all of the 4. cluster sample batches in a given month. The number of defective items is counted in 5. convenience sample randomly selected batches. The officer divides the batches made in a month into which day they were made. Then certain days