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Correlation and Regression
What does correlation measure between two variables?
Correlation measures the degree and direction of the linear association between two variables. It does not establish cause and effect.
What visual tool is used to detect a relationship between two variables before any calculation?
Scatter diagram
What is the key difference between correlation and regression?
Correlation measures how strongly two variables move together, while regression fits a predictive equation so that knowing one variable allows us to estimate the other.
In a scatter diagram, what pattern of dots indicates a direct (positive) relationship?
Dots rise from lower-left to upper-right
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