Final answer:
For adult CPR, the correct chest compression depth is at least 2 inches, with a rate of 100 compressions per minute.
Step-by-step explanation:
When giving chest compressions to an adult during CPR (Cardiopulmonary Resuscitation), the correct compression depth is at least 2 inches (5 cm) deep. This depth of compression is necessary to manually compress the blood within the heart enough to push some of the blood into the pulmonary and systemic circuits. It is crucial to achieve this compression depth as the brain can sustain irreversible damage within minutes of loss of blood flow. The recommended rate for chest compressions is 100 compressions per minute, which can be timed to the beat of the song "Staying Alive" by the Bee Gees.