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How do I calculate the value of the correlation coefficient? I know that the Correlation below is squared but I'm unsure of how to do

How do I calculate the value of the correlation coefficient? I know that the Correlation below is squared but I'm unsure of how to do it the other way around.

For example, I know that r=0.25 is 0.0625 and I know how to calculate that. But How do I calculate r² = 0.54? Thanks for your help!

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