Which pattern in a scatter plot indicates a perfect negative linear relationship?
Correct answer: B. Points lie on a downward-sloping straight line
- A. Points lie on an upward-sloping straight line
- B. Points lie on a downward-sloping straight line
- C. Points form a circular cloud around the mean
- D. Points lie randomly along a horizontal band
Explanation
A downward-sloping straight line means that every increase in one variable is matched by a constant decrease in the other. A circular or random cloud does not represent a perfect linear relationship.
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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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