Exam 11: Statistically Based Quality Improvement for Variables

In a variables control chart, which of the following is likely to occur if seven points, either increasing or decreasing, are in succession?

The moving average chart uses past information to predict what the next process outcome will be.

Random variation is also referred to as uncontrollable variation.

A ________ subgroup is a group of data that is logically homogeneous.

________ refers to the ability of a process to produce a product that meets specifications.

________ is based on the concept that all work occurs in a system of interconnected processes.

________ is a decision-making skill demonstrated by the ability to draw conclusions based on data.

In a variables control chart, which of the following is likely to occur if large jumps of more than three or four standard deviations take place?

Proportion defective, number defective, number nonconforming in a consistent sample space, and number defects per unit are examples of ________.

Producer's risk is also called a ________ error.

Describe the purpose of an s chart.

X chart limits are control limits and not natural limits.

Process population average, mean, range, moving range, and standard deviation are examples of ________.

The first step in developing process control charts is to identify critical product characteristics.

________ is the probability that a good product will be rejected.

Which of the following is true of random variation?

What is the difference between a variable and an attribute?

Statistical thinking is a decision-making skill demonstrated by the ability to draw conclusions based on data.

Use the following table to answer the question(s) below. -A machine shop owner wishes to monitor the diameter of an engine boring operation where the piston bore should be 4.25". He obtains 8 samples of 5 and records the data in the table above. What should the center line be for a chart that monitors process average?

If it is too time consuming or inconvenient to compute subgroup averages, a median chart should be used.