Answer to Question #129603 in Statistics and Probability for Zuga

Question

A correlation of -0,87 is a___
1. Strong correlation, thus indicating a casual relationship.
2. Moderate negative correlation, thus indicating a weak relationship.
3. Calculation error as the relationship cannot be negative.
4. Strong negative correlation, thus indicating an inverse relationship.

Answer 1

In general, correlation could be from -1 to 1. 1 means strong correlation (e.g. x and y are correlated, increasing of x cause increasing of y), -1 means strong negative correlation (increasing of x cause decreasing of y).

-0.87 is close to -1, so it is strong negative correlation (any correlation larger than 0.7 is called strong).

The answer: 4. Strong negative correlation, thus indicating an inverse relationship.