Two insect sprays are to be compared. Two rooms of equal size are sprayed, one with spray 1 and the other with spray 2. Then 100 insects are released in each room, and after 2 hours the dead insects are counted. The results is 64 dead in the room sprayed with spray 1 and 52 dead insects in the other room. Calculate a 95% con dence interval for the di fference in proportions of dead insectsfrom the two sprays.