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October 17th, 2018, 06:04 AM   #1
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Testing My Hypothesis About a Relationship

When I say "testing my hypothesis," I am not talking about statistical hypothesis testing. I expect x and y to have a strong positive correlation. I expect the same change in x to affect y more for the middle values of x than for each end, like the shape of y = -x^2. What would show if the same change in x affects y differently based on the value of x?
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October 18th, 2018, 09:00 AM   #2
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$\dfrac{dy}{dx}$?
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