If the correlation coefficient between study time and test marks is -0.85, the relationship is:
Correct answer: C. Strong and negative
- A. Strong and positive
- B. Weak and positive
- C. Strong and negative
- D. Weak and negative
Explanation
The magnitude 0.85 shows a strong relationship, while the negative sign shows that the variables move in opposite directions. Thus, greater study time is associated with lower marks in the observed data.
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About Correlation and Regression
Correlation describes the direction and strength of association between two variables using scatter diagrams and correlation coefficients. Regression covers fitted lines, regression equations, prediction and least squares, with a clear distinction between association and causation and between estimating a response value and reversing the roles of the variables.
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