If two things correlate or are correlated , they are closely connected or strongly influence each other. correlation-noun
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correlation of Earnings before Interest Depreciation Taxes and Amoritization and Revenue.
A parallel relationship with something, like pollen and allergy, dog and barking, wind and storm.
If measurements are taken for two (or more) variable for a sample , then the correlation between the variables are the sample correlation. If the sample is representative then the sample correlation will be a good estimate of the true population correlation.
Evidence that there is no correlation.
They can be positive correlation, negative correlation or no correlation depending on 'line of best fit'