Discussion
The coefficient of correlation :
Answer: A
The coefficient of correlation varies between ± 1.
Karl Pearson's coefficient r always lies between -1 (perfect negative correlation) and +1 (perfect positive correlation), with 0 meaning no linear correlation.
So it is not without limit and can never be more than 1. 'Can be less than 1' is true of most values but does not state the property, since r also cannot be less than -1.
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