Which statistical test to use?

Tradernico

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Aug 17, 2021
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Hi. I am working on a project trying to determine which of four chemical analysis methods best quantify chemical concentrations in a sample. For each chemical analysis method, I have data for measured and actual concentrations. Then, using that data, I’ve calculated “Accuracy” which is calculated as: (actual concentration -measured concentration)/actual concentration. I will be doing the statistical analysis on the Accuracy dataset.

I have Accuracy data for the 4 different types of chemical analyses (which are my statistical groups). The accuracy values range from about -0.10 to 0.10, with 0 being complete accuracy. The data is normally distributed. I am essentially trying to statistically show which of the chemical analysis methods are the most accurate, e.g. which method has accuracy closest to 0.

How can I show statistically which of the four methods has the lowest accuracy value (aka accuracy closest to 0)?
 
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