Test
Correlation and linear model
This test evaluates relationships between two variables using correlation and a linear model. Students interpret the correlation coefficient and R², calculate predictions and residuals and assess model suitability and the limits of causal conclusions.
Time left: 00:00:00
Sample questions
- The correlation coefficient is r = ___. What is the direction?
- Use R², the direction of the regression line and the variables' standard deviations to find the slope of the regression line.
- Find the value of x for which two linear trend models give the same prediction.
- Which variable in a linear model is called dependent?
- Compare correlations r₁ = ___ and r₂ = ___. Which is stronger?
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