Frequently Asked Questions
What does a scatter plot show?
The relationship between two paired variables. Points climbing left-to-right = positive correlation; falling = negative; scattered = none.
Why use correlation r?
It standardizes covariance to a -1 to +1 scale, so you can compare relationships across different units.
Is r enough to summarize the relationship?
Only if the relationship is roughly linear. Always look at the scatter; r misses curves and clusters.
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