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Topic Need Help with Control Chart Problem

Need Help with Control Chart Problem

Home Forums General Forums Tools & Templates Need Help with Control Chart Problem

This topic contains 6 replies, has 3 voices, and was last updated by  MBBinWI 4 years, 9 months ago.

Viewing 7 posts - 1 through 7 (of 7 total)
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  • #203319 Reply

    Shawn Jensen

    The sample size is n = 7. Xbar and R are computed for each sample. After 35 samples, it is found that

    I found Xbar to be 7805 and R to be 1200.

    (a) Set up and R charts for this process. Is this process in statistical control?
    (b) Assuming that both charts exhibit control, estimate the process mean and standard deviation.
    (c) If the quality characteristic is normally distributed and if specifications are 220 ±35, can the process meet the specifications? Estimate the fraction nonconforming.
    (d) Assuming the variance to remain constant, state where the process mean should be located to minimize the fraction nonconforming. What would be the value of the fraction nonconforming under these conditions?

    How would I find these information? I know I need to find LCL and UCL, but I don’t know how to.

    #203405 Reply


    #203423 Reply

    @Darth That sounds familiar. This guy ever meets you he will throw a chair at you.

    #203629 Reply

    Cripes, folks. A little diplomacy goes a long way.

    Shawn — They’re right, this isn’t a site for getting homework assignments answered. We all had to suffer though it so those behind us must, too. Plus, that’s how you learn. As for the UCL and LCL, any statistical software program, including Excel, will help you get there. The rest you have to work through.

    #203669 Reply

    Marcy, you are obviously a Newbie. After dealing with folks like Shawn, if you don’t nip it in the bud the site gets swamped with people wanting you to do their homework, pick their projects and our all time favorite, select a topic for their Dissertations.

    #203757 Reply

    Don Strayer
    Reputation - 979
    Rank - Copper

    While people shouldn’t come to this forum to find someone to do their homework, at least we should be willing to point them in the right direction. For instance, a simple reminder that the control limits are 3 standard deviations above and below the mean? Real teachers don’t provide the answers or disparage those who ask for answers. They help them to find the answers for themselves.

    #203779 Reply

    @Straydog – but real “students” attempt an answer and provide their reasoning and ask what, if anything, they got wrong. They don’t just throw-up the question and say “answer this for me.”

Viewing 7 posts - 1 through 7 (of 7 total)

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