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Thread: Help needed in finding a viariable

  1. #1
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    Help needed in finding a viariable

    Hi all, I am a footwear quality inspector struggling to come up with an equation that I can use to determine if a batch produced over an 1 hour period is deemed as conform or non conform.

    The footwear industry uses the AQL standard to assess the quality of a product. Within a produced quantity a set amount of samples will be inspected and the defects are categorized as critical, minor or majors. Per each set amount of samples inspected there is a limit of defects in each defect category that will be acceptable in order for the full produced quantity to be deemed as conform.
    Critical defects were ignored from example below:

    1201 to 3200 pairs - inspect 125 pairs - 7 majors and 10 minors or less = conform
    3201 to 10.000 pairs - inspect 200 pairs - 10 majors and 14 minors or less = conform
    10.001 to 35.000 pairs - inspect 315 pairs - 14 majors and 21 minors or less = conform

    I have started to sit for 1 hour periods at the very end of the production line in order to count the amount of defects that are packed into shoe boxes.
    Before the assessment begin I count the number of pairs packed within a 5 minute time period and again at any moment during the 1 hour assessment.
    My presence in production line does influence the packing rate as factory quality controllers are more careful with the shoes that they put through packing.

    Before assessment: 30 pairs packed in 5 minutes
    During assessment: 20 pairs packed in 5 minutes

    So, during the assessment I have found 12 defects in 240 pairs, how can I calculate the amount of defects that would be accepted in a 60 minute period based on the quantity produced?

    Everyones suggestion are welcome.
    Last edited by AndreDias; Oct 20th 2017 at 07:28 PM.
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  2. #2
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    Re: Help needed in finding a viariable

    This all seems like pretty remedial stuff for a professional quality assurance inspector.

    This looks to be a pretty good rundown of the math you'll need to perform your job.

    https://onlinecourses.science.psu.edu/stat200/node/19
    Thanks from alexcordero
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  3. #3
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    Re: Help needed in finding a viariable

    Somewhat judgemental but I'll take it as your contribution, thank you for your time.
    Last edited by AndreDias; Oct 22nd 2017 at 01:31 AM.
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  4. #4
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    Re: Help needed in finding a viariable

    Quote Originally Posted by AndreDias View Post
    Somewhat judgemental but I'll take it as your contribution, thank you for your time.
    Just the way I am. If you're taking money for something I feel you should know how it's done.
    Thanks from DenisB
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  5. #5
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    Re: Help needed in finding a viariable

    The world is an unfair place, I agree. But hey, at least I am directing my efforts in making something productive, It can't be all that bad.
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  6. #6
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    Re: Help needed in finding a viariable

    Quote Originally Posted by AndreDias View Post
    The world is an unfair place, I agree. But hey, at least I am directing my efforts in making something productive, It can't be all that bad.
    did that link help at all?
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