When the distribution is bimodal (two peaks), usually there are two process: it means that the products are manufacturing in slightly different conditions (machining on two different milling machines for instance).
You have to :

Question

When the distribution is bimodal (two peaks), usually there are two process: it means that the products are manufacturing in slightly different conditions (machining on two different milling machines for instance). 
 You have to :

Accepted Answer

Investigate and if there are two process, separate the two data set and analyse separately each data set

Answer

Never mind, analyse the data set as if it was normaly distributed.

Answer

Do nothing : it's only those who do nothing that make no mistakes.

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When the distribution is bimodal (two peaks), usually there are two process: it ...

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