I have a data series, sediment concentration in water versus time. The data is not normal but I want to use regression and so have logged the sediment concentration ( $\log_{10}(x)$ ). The residual and fit to model is now much better. I want to use the p value and r squared values from the logged regression output. Do these need to be transformed back using $e^x$ ? This is being carried out in Excel using the data analysis tool:

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