Answer :
A correlation is a metric used to quantify the degree to which two events, scores, or other things that can be recorded and counted are related. Examples of common dependent phenomena include the relationship between parent and child height and the relationship between a good's price and the number of units buyers are prepared to buy, as shown in the so-called demand curve.
Because they can reveal a predicted relationship that can be used in practice, correlations are helpful. The relationship between electricity demand and weather, for instance, may cause an electrical company to supply less power on a mild day.
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