Grade 8 · Math
Describe association in paired data
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Paired measurements: (1, 1), (2, 3), (3, 4), (4, 6), (5, 9).
Which description best matches the overall direction of these paired data?
- proof that the first variable causes the second
- an upward trend
- no clear upward or downward trend
- a downward trend
See the answer & why
an upward trend
Higher first values are paired with higher second values in these data. Association in a data set does not by itself establish cause.
A little hint: Read the pairs from smaller to larger first coordinates and look for an overall direction.
Each point in a scatter plot represents one pair of measurements from the same observation.
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