Locus of control suggests that people either believe they control their own lives or believe their destinies are controlled by others or chance.

True.  This is a psychological belief that people control their lives or factors in the environment or society control it. Those believe they control their lives have a strong internal locus while those who believe life is determined by the factors around them have strong external locus.

when in a crucial situation, after calling 911, the correct posture for delivering effective compression is the proper hand placement.

first, place two fingers at the sternum, then put the heel of your other hand next to the fingers and place hand on top of the other. lock your elbows by using your body’s weight and compress the victim’s chest with a depth of 2 inches.

moreover, do 15 compression and 2 breaths, this process must be done four times until there is a pulse or a arrive.