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MGMT 6360 POM Quiz 2 Name_________________________________ 1. You want to develop 3 sigma level process control charts to check the weight of boxes that contain trash. Due to different content of trash, weights are varying. You performed 4 samplings. Each time, they measured 3 units (n = 3). Draw control charts and make conclusion whether things are under control. Sampling 1 20 24 26 Sampling 2 28 30 24 Sampling 3 24 28 26 Sampling 4 28 20 26 Factors for 3 Sigma level Sample Control Limit Factor Control Limit Factor Size for Sample Mean for Sample Range n A2 D3 D4 2 1.880 0 3.267 3 1.023 0 2.575 4 0.729 0 2.282 5 0.577 0 2.116 10 0.308 0.223 1.777 15 0.223 0.348 1.652 20 0.180 0.414 1.586 25 0.153 0.459 1.541 2. The number of weekly customer complaint is monitored in a small hotel using a c-chart. Develop three sigma level control charts using the data below. Calculate and show values for UCL, CL, and LCL. Is everything under control? Discuss your conclusion. week # of complaint 1 3 2 2 3 3 4 1 5 3 3. A small town is concerned about public reaction to its new high voltage electric tower project that is currently in progress. In order to measure resident's perception, a weekly survey is conducted. Each time, a sample of 100 residents is surveyed. The results to date are shown below. The Pchart can be used. Draw the graph and plot data. Is everything under control? Analyze data using 5% risk of Type I error (z=1.96). 4. ABC sells no-spill syrup in bottles. Management is evaluating four different machines with standard deviations of .006, .01, .022, and .04 ounces for Machines A, B, C, and D, respectively. The specification limit is s 11.95 and 12.05 ounces. Which machines should receive more detailed evaluation (which machines are statistically capable)