Question: 1. A student wants to develop 3-sigma level variable control charts for monitoring firewood length. Due to uneven shape of firewood, length of wood varies.

1. A student wants to develop 3-sigma level variable control charts for monitoring firewood length. Due to uneven shape of firewood, length of wood varies. Draw X-bar chart and R- chart. For both charts, calculate UCL, CL and LCL by using the factors provided in the table (standard deviation for process is unknown). Is the process under control? Discuss your finding. Length in inches from 4 weeks with sample size of 3 (3 observations each time, n=3) are: week 1 Week 2 Week 3 week 4 23 24 26 28 28 28 32 24 30 32 25 22

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