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Can correlation be used to describe a curved relationship between variables, or

Can correlation be used to describe a curved relationship between variables, or only the strength of a linear relationship between two variables? In general, would you use correlation to completely describe two variable data?In your own words how do you define a regression line, and what is it used to do?Specifically, comment on what a least-squares regression line is.How is regression different than correlation?What does the square of the correlation, r2, signify? What does an r2 value of 1 mean?A prediction is only as good as the correlation it is based on. Explain, use an example of your own about a variable you are interested in.

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