Which of the following values could not represent a correlation coefficient?

• A. $0$
• B. $0.8$
• C. $1.2$
• D. $-1$

Answer: (C)

Verified step by step guidance

1. Recall that the correlation coefficient, often denoted as \(r\), measures the strength and direction of a linear relationship between two variables.
2. Understand that the value of a correlation coefficient must always lie within the range \(-1 \leq r \leq 1\).
3. Check each given value to see if it falls within this range: 0, 0.8, 1.2, and -1.
4. Identify that 0, 0.8, and -1 are all within the valid range for a correlation coefficient.
5. Recognize that 1.2 is outside the valid range, so it cannot represent a correlation coefficient.