Homework Answers
Answer (a)
Mean:
c-bar = (4+10+16+8+9+6+5+14+13+7+6+4+2+10) / 14 = 114 / 14 = 8.143
Control limits for three sigma limits :
UCL = c-bar +3 (sqrt (c-bar)) = 8.143 + 3 (sqrt (8.143)) = 8.143 + 8.562 = 16.705
LCL = c-bar – 3 (sqrt (c-bar)) = 8.143 – 3 (sqrt (8.143)) = 8.143 – 8.562 = - 0.419 or 0
Answer (b) The process is in control as all the points does fall between 16.705 and 0.
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