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Relationships Between Variables flashcards
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- What does “Scatterplot Coordinates” mean?Scatterplots
- A display of relationships between paired numerical variables.
- What important condition applies to scatterplot coordinates?Scatterplots
- Two selected points do not characterize the full dataset.
- What does “Local Point Comparisons” mean?Scatterplots
- A rate comparison between two paired observations.
- What important condition applies to local point comparisons?Scatterplots
- Do not substitute a chosen two-point slope for a fitted regression coefficient.
- What does “Correlation and Explained Variation” mean?Correlation
- A linear-association summary and its squared relationship to simple-regression R².
- What important condition applies to correlation and explained variation?Correlation
- This r² identity has a specified regression setting.
- What does “Correlation and Units” mean?Correlation
- The invariance of correlation to positive changes of measurement scale.
- What important condition applies to correlation and units?Correlation
- A slope’s numerical value can change even when correlation does not.
- What does “Regression Predictions” mean?Linear Regression and Residuals
- A model-based response estimate using an explanatory input.
- What important condition applies to regression predictions?Linear Regression and Residuals
- Check the observed input range before extrapolating.
- What does “Residuals” mean?Linear Regression and Residuals
- A signed prediction error used to evaluate a fitted model.
- What important condition applies to residuals?Linear Regression and Residuals
- Residual is observed minus predicted, not the reverse.