Final answer:
The proper hand placement for chest compression during CPR is between the lines at T4 and T9 on the sternum.
Step-by-step explanation:
The proper hand placement for chest compression during CPR is accomplished by placing the heel of one hand on the sternum between the lines at T4 and T9 (Figure 19.3). By applying pressure with the flat portion of the hand, it is possible to manually compress the blood within the heart enough to push some of the blood into the pulmonary and systemic circuits.