Two events are said to be correlated if

If the change in values of one set doesn't affect the values of the other, then the variables are said to have "no correlation" or "zero correlation." A causal relation between two events exists if the occurrence of the first causes the other.

A) by determining whether one of the events led to the other

A correlation among variables, nevertheless, does not automatically imply that the variation in one variable is the beginning of the difference in the importance of the other variable. Causation symbolizes that one effect is the outcome of the experience of the other development; i.e. there is a causal association within the two performances.

a. there was serious competition for tech jobs at the downtown clinic.

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