The values of two different variables are related to each other such that an increase in the value of the first variable is accompanied by a decrease in the value of the second variable. If the variables are perfectly correlated, their correlation coefficient will be equal to
Correct Answer: D
The correlation coefficient measures the strength and direction of a linear relationship between two variables.
A correlation coefficient of -1.0 indicates a perfect negative correlation, meaning that as one variable increases, the other decreases.
References:
* Moore, D.S., McCabe, G.P., & Craig, B.A. (2017). Introduction to the Practice of Statistics. W.H.
Freeman.
* Montgomery, D.C. (2009). Introduction to Statistical Quality Control. Wiley.