Scatter Plots and Bivariate Data Flashcards
Grade 8 · Math · Flashcards
Key vocabulary for scatter plots, associations, and trend lines.
Flashcards
- Bivariate data
- Data with two variables measured on the same subject.
- Scatter plot
- A graph of bivariate data as (x, y) points on a coordinate plane.
- Positive association
- Both variables increase together; plot trends upward.
- Negative association
- One variable increases as the other decreases; plot trends downward.
- No association
- No pattern in the scatter plot; variables appear unrelated.
- Strong association
- Data points cluster tightly around the trend line.
- Weak association
- Data points scattered loosely around the trend line.
- Line of best fit
- Line representing the data trend; used for predictions.
- Outlier
- A point far from the pattern; may be an error or exceptional case.
- Interpolation
- Predicting within the data range using the trend line.
- Extrapolation
- Predicting beyond the data range; less reliable the farther out you go.
- Correlation vs. causation
- Correlation = variables are related. Causation = one causes the other. They are not the same.
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