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Would it be OK to combine results from two machining fixtures into one control chart if the underlying populations would in effect create a bi-modal distribution, but we are using a sample size of 5 in our sub-groups ?
Would combining even more data that would in effect create tri-modal, quatro-modal or penta-modal and above (if those are the correct terms !) ?
I understand that using average and range charts means that no matter the underlying distribution, the sample means will always conform to a normal distribution - is this true and therefore could I apply the above logic ?
Would combining even more data that would in effect create tri-modal, quatro-modal or penta-modal and above (if those are the correct terms !) ?
I understand that using average and range charts means that no matter the underlying distribution, the sample means will always conform to a normal distribution - is this true and therefore could I apply the above logic ?