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Math Help - HELP in Control Chart for the average (x̄) and the range (R).

  1. #1
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    HELP in Control Chart for the average (x̄) and the range (R).

    Hi,

    I just want to ask if my answers are correct in getting trial central line and control limits. Subgroup size is 4. Subgroup number is 25.
    The given are:


    (X-bar)
    = 12063

    ∑R= 626

    X-double bar= 482.52
    R-bar= 25.04


    A2 = 0.729

    D
    4 = 2.282
    D3 = 0


    UCL
    x̄= (X-double bar)+A
    2 (R-Bar)
    = 482.52+ 0.729(25.04)
    = 500.77

    LCL
    x̄= (X-double bar)-A
    2 (R-Bar)
    = 482.52- 0.729(25.04)

    = 464.27




    UCL (R-bar)= D4(R-bar)


    = 2.282(25.04)

    = 57.14

    LCL (R-bar)= D3(R-bar)

    = 0(25.96)

    =0



    Did I use the correct formulas?

    Thanks I hope you can helpme.









    Last edited by night01; April 21st 2012 at 07:34 AM.
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