1. Develop 3 sigma level process control charts for monitoring weight of firewood in bags. An inspector performed sampling over 4 weeks of time frame. Each time, 4 observations were made as below. Calculate and show values for UCL, CL, and LCL using the factors provided in below table (do not calculate these values using the raw data). Draw variable control charts (mean and range). Discuss your conclusion. You can draw using Excel or hand draw and scan. week 1 week 2 week 3 week 4 24 2226 20 28 30 21 24 2222 20 30 28 20 26 26 22 24 26 123452223 A2 Factors for 3 Sigma level (page 195 of textbook) Sample Control Limit Factor Size n for Sample Mean Control Limit Factor for Sample Range D3 D4 1.880 0 3.267 1.023 0 2.575 0.729 0 2.282 0.577 0 2.116 10 0.308 0.223 1.777 0.223 0.348 1.652 20 0.180 0.414 1.586 0.153 0.459 1.541