A scatter plot of pupils' study hours versus exam scores shows points sloping tightly from lower left to upper right. What correlation does this demonstrate?
Answer and explanation
Correct answer: D. Strong positive linear correlation
- Step 1: When both variables increase together along a straight path, the relationship is positive and linear. Step 2. A tight grouping indicates strong correlation (close to +1.0). Answer: Strong positive linear correlation. Why not the others: Strong negative slopes downward from top left to bottom right; zero correlation shows a circular cloud; curvilinear forms a parabola.
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