A cereal manufacturer uses a machine to fill boxes with cereals. The labeled weight of the cereal boxes is 20 ounces. The firm’s quality control engineer sampled five boxes every two hours for three days and her sample observations are given below. The firm wants to construct x-charts and R-charts to monitor the filling process. For the sample data, 

a) Determine the upper and lower control limits of the x-chart, where sigma = 3 

 

b) Determine the upper and lower control limits of the R-chart, where sigma = 3 

c) Is the process under control? Sample Cereal Box Weights (ounces)

Transcribed Image Text:

Range Sample 1 Мean Sample Mean Range 0.93 20.39 0.82 20.32 19.71 0.99 7. 19.67 1.89 3 20.36 1.30 8. 19.80 1.70 4. 19.62 1.51 9. 20.40 0.38 20.40 0.76 10 20.36 0.71 Range Sample 1 Мean Sample Mean Range 0.93 20.39 0.82 20.32 19.71 0.99 7. 19.67 1.89 3 20.36 1.30 8. 19.80 1.70 4. 19.62 1.51 9. 20.40 0.38 20.40 0.76 10 20.36 0.71

Answer rating: 100% (QA)

A C D E F 1 Mean Range Sample Mean Range Xbar UCL LCL Rbar UCL LCL 3 2039 082 20103 2074 19... View the full answer