Question: A student wants to develop 3-sigma level variable control charts for the weight of firewood that comes in a box. Due to uneven shape of

  1. A student wants to develop 3-sigma level variable control charts for the weight of firewood that comes in a box. Due to uneven shape of wood, weight of box varies a lot. Draw X-bar chart and R-chart using the table below. For both charts, calculate and show UCL, CL and LCL. Discuss your results. Weight in pounds from four samplings with sample size of three (n=3) are:

Sampling 1 Sampling 2 Sampling 3 Sampling 4

18 38 22 26

26 30 28 20

26 26 26 26

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