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MQM 227 | Chapter 9 Exam Q&A | Quality Control, Process Variation, Six Sigma | Illinois State University

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This document contains a complete set of verified Chapter 9 exam questions and answers for MQM 227 – Operations Management at Illinois State University. Designed for students preparing for quality control assessments, it presents both multiple-choice and true/false questions with correct answers marked clearly. The content emphasizes core quality assurance principles used in manufacturing and service operations. Topics covered include: Quality control systems: Critical control points, variable vs. attribute measurements, defect classification Process control concepts: Common vs. special cause variation, control charts, and process capability Quality improvement tools: Pareto charts, fishbone (cause-and-effect) diagrams, histograms, and trend analysis Statistical quality assurance: Sampling inspection, standard deviation, Six Sigma methodology Six Sigma principles: Defect rates, project roles (Black Belts), differences between Six Sigma and Lean Operational diagnostics: Identifying process shifts, root causes of defects, indicators of stability Assumptions in quality systems: Random variability, control limit interpretation, waste elimination This guide is particularly useful for undergraduate students in operations management, quality control, and business process analysis, as well as students in industrial engineering or applied statistics. It supports exam success through clearly explained, curriculum-aligned terminology and practical examples. Keywords: MQM 227, quality control, Six Sigma, process control, special cause variation, common cause, Pareto chart, attribute measurement, control chart, process capability, Lean, Illinois State University

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MQM 227 - Chapter 9 Exam Questions
and Answers 100% Correct

1. A complete system of quality control:

A. Is defined by critical control points, inspectors, measurements, costs,

and other considerations

B. Involves a zero defects philosophy

C. Requires a continuous scale for measurement of defects

D. Must include both variable and attribute measurements - 🧠 ANSWER

✔✔A. Is defined by critical control points, inspectors, measurements, costs,

and other considerations

2. Sampling inspection by attributes:

, A. Means each item sampled is classified as defective or not defective

based on quality standards

B. Could be used together with process control and variable measurement

as part of a quality control system

C. Utilizes a discrete scale of measurement


D. a, b, and c - 🧠 ANSWER ✔✔D. a, b, and c


3. Which of the following statements about process quality control is NOT

true?

A. Assignable cause variation is also referred as special cause variation

B. An observation outside the control limits is an example of a special

cause of variation

C. Common cause variation can be eliminated from the process by

removing the potential causes

D. The control limits will include 99.74% of the population under the normal

probability distribution assuming that the process is in control - 🧠 ANSWER

✔✔C. Common cause variation can be eliminated from the process by

removing the potential causes

4. A process control chart:

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