The Quality Assurance Department selected a sample of 12 printed circuit boards and tested them. The number of defects in each circuit board was 3, 3, 0, 5, 1, 1, 5, 6, 6, 2, 0, and 1. What kind of control chart should be constructed to monitor the process? A. Mean chart B. Range chart C. Percent defective chart D. C-bar chart Fill-in
To determine what kind of control chart should be constructed to monitor the process, we need to analyze the characteristics of the data. The different control charts monitor different aspects of a process.
The mean chart (A) is used to monitor the average value of a process. It helps detect shifts or changes in the central tendency of the data.
The range chart (B) is used to monitor the variability or dispersion of a process. It helps detect changes in the spread of the data.
The percent defective chart (C) is used to monitor the proportion of defective items in a process. It helps detect changes in the rate of defects.
The c-chart (D) is used to monitor the number of defects per unit of measurement, typically used for counting data. It helps detect changes in the number of defects.
In this case, we have the number of defects in each printed circuit board, which represents counting data. Therefore, the appropriate control chart to construct would be the c-chart (D) to monitor the number of defects in the circuit boards.