1. A student wants to develop 3-sigma level variable control charts for monitoring firewood length. Due to the uneven shape of firewood, the length of the 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 (the standard deviation for the process is unknown). Is the process under control? Discuss your finding. Length in inches from 4 weeks with a sample size of 3 (3 observations each time, n＝3) are: week 1 Week 2 Week 3 week 4 23 24 26 28 25 28 28 32 22 24 30 32 and this is teh second question: 2. One location of a city is selected as a potential location for a garbage dump site. Fifty (50) residential homes that are located near the site are concerned about this. A monthly survey was conducted for 8 weeks and the result is tabulated below. Draw a 3-sigma level attribute control chart to analyze the situation. Calculate and show values for UCL, CL, and LCL. Discuss your conclusion. Week 1 2 3 4 5 6 7 8 complaints 7 6 8 7 2 9 6 3
