The correlation coefficient is a unit-free measure which ranges from -

Correct option is B

· Correct answer: (b) -1 to +1
· The correlation coefficient measures the strength and direction of a linear relationship between two variables, and it ranges from -1 to +1.
Other options:
· (a) 0 to 1: Incorrect, as the correlation coefficient can be negative, indicating a negative relationship.
· (c) 0 to ∞: Not correct, as the correlation coefficient is bounded between -1 and +1.
· (d) 0 to 5: Not applicable for the correlation coefficient.