Which correlation value has the lowest strength?

• A. -0.2
• B. -0.8
• C. 0.5
• D. 0.1

Answer: (D)

The strength of a correlation is determined by the magnitude of the coefficient, not its sign. The correlation coefficient ranges from -1 to 1, where the sign shows direction and the magnitude shows strength. Compare the magnitudes: 0.2, 0.8, 0.5, and 0.1. The smallest magnitude is 0.1, so that value represents the weakest linear relationship. The others are stronger because their magnitudes are larger, even though some are negative. Therefore, 0.1 has the lowest strength.