A quality control sampling scheme was carried out by Sony for estimating the percentage of defective radios in a large shipment of 1,000 containers with 100 radios in each container. Twelve containers were chosen at random, and every radio in them was checked. The numbers of defective radios in each of the containers are 8, 10, 4, 3, 11, 6, 9, 10, 2, 7, 6, 12. Give a 95% confidence interval for the proportion of defective radios in the entire shipment.