Certified Quality Technician Questions Flashcards

What is the difference between 'accuracy' and 'precision' in measurement?

Answer: Accuracy is closeness to the true value; precision is repeatability of results

Accuracy refers to how close a measurement is to the true value, while precision refers to the consistency or repeatability of repeated measurements.

Which quality tool is used to separate a population into homogeneous subgroups to reveal patterns that would otherwise be hidden?

Answer: Stratification

Stratification divides data into subgroups based on shared characteristics (e.g., shift, machine, operator) to reveal underlying patterns and sources of variation.

A supplier delivers a lot of 500 parts. Using ANSI/ASQ Z1.4, the inspector uses a normal inspection level II. This level is:

Answer: The standard default inspection level for most situations

Inspection Level II is the standard default level used for most inspection situations under ANSI/ASQ Z1.4.

The 'hidden factory' concept in quality refers to:

Answer: The rework, scrap, and inspection activities that absorb resources without adding value

The hidden factory describes all the non-value-added activities such as rework, scrap, re-inspection, and sorting that result from poor quality and consume capacity.

Which of the following describes a Type I error in hypothesis testing?

Answer: Rejecting the null hypothesis when it is actually true

A Type I error (false positive or alpha error) occurs when the null hypothesis is rejected even though it is actually true.

What is the primary benefit of using designed experiments (DOE) in process improvement?

Answer: Understanding the effect of multiple factors on output simultaneously and efficiently

DOE allows quality technicians to study the effects of multiple input variables on a response variable simultaneously, identifying main effects and interactions more efficiently than one-factor-at-a-time testing.

In a control plan, the column 'reaction plan' specifies:

Answer: What actions operators must take when a process goes out of control

The reaction plan column in a control plan tells operators the specific steps to follow — such as stopping the process, segregating suspect product, and notifying supervision — when a control characteristic falls outside its control limits.