there is scenario, so i have an experiment that accumulates cadmium in plants with different amendments and they turn out to be different sizes will the amount of cd differ in each 1 gram of plant with different sizes, what formula can be used
An regression function of some sort is needed, plant size against accumulation of Cd. There are special tools for regression analysis, but simple functions are included in, for example, Excel: https://www.excel-easy.com/examples/regression.html It is not certain that linear regression provides the best fit, but there are other methods. Also in Excel.
You might try this software, which has many model functions & real examples:
www.lerenisplezant.be/fitting.htm
If you can share some data, I could have a look too.
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