I just need a quick answer, say I have a bunch of data points on a graph, I made a trendline with a function of(adsbygoogle = window.adsbygoogle || []).push({});

y = 5x + 6, and a r value of R^2 = 3, is there a way of converting the r value into a percent uncertainty in the prediction of the functions? Say I used the function to predict when x = 4, the result would be 26 when the function is infinitely accurate, but since it's not, how can I add an uncertainty value to the 26?

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# Excel r value to percentage

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