Control charts for X-bar and R are maintained for the tensile strength of fibers used in composite materials. The specifications are 440±40. After 36 samples of size n=7 are analyzed, we find that: 36 36 X¡ = 12,870 R¡ = 1,350 i=1 i=1 What are the limits of the X-bar chart? O UCL=442.86 and LCL=415.14 O UCL=531.43 and LCL=498.17 UCL=415.18 and LCL=389.19 UCL=373.21 and LCL=341.79 UCL=335.89 and LCL=307.61

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Control charts for X-bar and R are maintained for the tensile strength of fibers used in composite materials.
The specifications are 440+40. After 36 samples of size n=7 are analyzed, we find that:
36
36
X¡ = 12,870
Ri
= 1,350
i=1
What are the limits of the X-bar chart?
UCL=442.86 and LCL=415.14
UCL=531.43 and LCL=498.17
UCL=415.18 and LCL=389.19
UCL=373.21 and LCL=341.79
UCL=335.89 and LCL=307.61
Transcribed Image Text:Control charts for X-bar and R are maintained for the tensile strength of fibers used in composite materials. The specifications are 440+40. After 36 samples of size n=7 are analyzed, we find that: 36 36 X¡ = 12,870 Ri = 1,350 i=1 What are the limits of the X-bar chart? UCL=442.86 and LCL=415.14 UCL=531.43 and LCL=498.17 UCL=415.18 and LCL=389.19 UCL=373.21 and LCL=341.79 UCL=335.89 and LCL=307.61
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