What you’ll learn
Identify positive, negative and no association.
Key idea
Association direction concerns how vertical observations change with horizontal position, not their individual signs.
Trend direction is not coordinate sign; the balanced displayed cloud has the same vertical levels at every horizontal value.
Worked example
Classify examples and non-examples for the concept 'Identify positive, negative and no association'.
Classify the direction of association in this labeled observed point cloud, with evidence.
Marked coordinates: *=(0, 5); *=(1, 4); *=(2, 3); *=(3, 2).
- Order the observations by x: [(0, 5), (1, 4), (2, 3), (3, 2)].
- Negative association: y falls with increasing x. Coordinate positivity alone says nothing about trend direction.
Answer: Negative association — y falls with increasing x.
Quick Check
Classify examples and non-examples for the concept 'Identify positive, negative and no association'.
Classify the direction of association in this labeled observed point cloud, with evidence.
Marked coordinates: *=(0, 5); *=(1, 5); *=(2, 5); *=(0, 2); *=(1, 2); *=(2, 2).