Which of the following is an example of statistical quality control?

• A. Calculating the area of a triangle using geometry
• B. Using control charts to monitor the diameter of manufactured bolts
• C. Measuring the speed of a car with a speedometer
• D. Reading a thermometer to check the temperature of a room

Answer: (B)

Verified step by step guidance

1. Understand the concept of statistical quality control (SQC), which involves using statistical methods to monitor and control a process to ensure that it operates at its full potential to produce conforming products.
2. Recognize that SQC typically uses tools like control charts to track variations in a manufacturing or production process over time.
3. Evaluate each option to see if it involves monitoring a process using statistical tools: calculating an area is a geometric calculation, measuring speed or temperature are direct measurements without statistical monitoring.
4. Identify that 'Using control charts to monitor the diameter of manufactured bolts' fits the definition of SQC because it involves collecting data over time and using statistical methods to detect any deviations from the desired quality.
5. Conclude that the correct example of statistical quality control is the use of control charts to monitor the diameter of manufactured bolts.