How do you determine the standard deviation of samples for QC. Do you use the sample mean or the nominal value (what the samples should weigh)

I have to determine if our packaging machine is packing the correct weights. So I need to draw samples and determine if the weights are within the limits. To test my compliance with sampling I must determine the SD and multiply it with the correction factor. Do I use the sample mean to determine my SD or the nominal value/ declared mass of packages?

Asked by: Lehana 609 days ago - 1 Answers - 1238 views

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Assuming you have access to both the sample mean and the nominal value/declared mass of packages, you can use either, but should use both to determine the SD. If you use the sample mean, you will determine the SD per sample. If you use the declared mass, you will determine the SD of the whole, or all of the samples. The SD per sample, multiplied by the number of samples, should result in the SD of the declared mass. This way, you can verify that the SD you’ve determined is about the same, whether it’s per sample or in mass value.
**You will need to know if the correction factor is to be applied “per sample” or to the mass before you multiply it with the SD.

Answer by moodwad 605 days ago

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