Question

The coefficient of correlation is always between

• A. $0and1$
• B. $-1and1$
• C. $-\infty and\infty$
• D. $-10and10$

Answer 1

Answer: (B)

$-1and1$

$\Rightarrow$ Correlation coefficients are expressed as values between $-1$ and $+1$.

$\Rightarrow$ A coefficient of $+1$ indicates a perfect positive correlation: A change in the value of one variable will predict a change in the same direction in the second variable.

$\Rightarrow$ A coefficient of $-1$ indicates a perfect negative correlation: A change in the value of one variable predicts a change in the opposite direction in the second variable.