Operations Management Quiz 3 Chapter 6, 6S

If X-double-bar = 23 ounces, σ = 0.4 ounces, and n = 16, what will be the ±3σ control limits for the x-bar chart? A) 22.70 to 23.30 ounces B) 21.8 to 24.2 ounces C) 22.25 to 23.75 ounces D) 23 ounces

A) 22.7 to 23.3 ounces

A quality circle holds a brainstorming session and attempts to identify the factors responsible for flaws in a product. Which tool do you suggest they use to organize their findings? A) Ishikawa diagram B) Pareto chart C) flowchart D) control charts E) activity chart

A) Ishikawa diagram

Costs of dissatisfaction, repair costs, and warranty costs are elements of cost in the: A) quality loss function. B) Pareto chart. C) ISO 9000 quality cost calculator. D) process chart. E) Ishikawa diagram.

A) Quality loss function

Which of the following is FALSE regarding control charts? A) Values above the upper control limits imply that the product's quality is exceeding expectations. B) Control charts are built so that new data can be quickly compared to past performance data. C) Control charts graphically present data. D) Control charts plot data over time. E) None of the above is false.

A) Values above the upper control limits imply that the product's quality is exceeding expectations.

A manager wants to build 3-sigma x-bar control limits for a process. The target value for the mean of the process is 10 units, and the standard deviation of the process is 6. If samples of size 9 are to be taken, what will be the upper and lower control limits, respectively? A) -8 and 28 B) 16 and 4 C) 12 and 8 D) 4 and 16 E) 8 and 12

B) 16 and 4

If 1 million passengers pass through the St. Louis Airport with checked baggage each month, a successful Six Sigma program for baggage handling would result in how many passengers with misplaced luggage? A) 6.0 B) 3.4 C) 34 D) 2700 E) 6 times the monthly standard deviation of passengers

B) 3.4

Three broad categories of definitions of quality are: A) product quality, service quality, and organizational quality. B) user based, manufacturing based, and product based. C) internal, external, and prevention. D) low-cost, response, and differentiation. E) Pareto, Shewhart, and Deming.

B) user based, manufacturing based, and product based.

If the Cpk index exceeds 1: A) the AQL must be smaller than the LTPD. B) σ must be less than one-third of the absolute value of the difference between each specification limit and the process mean. C) the x-bar chart must indicate that the process is in control. D) the process is capable of Six Sigma quality. E) the process is characterized as "not capable."

B) σ must be less than one-third of the absolute value of the difference between each specification limit and the process mean.

One of Britain's largest children's hospitals working with a Ferrari racing team is an example of: A) internal benchmarking. B) external benchmarking. C) Taguchi concepts. D) employee empowerment. E) corporate responsibility.

B.) External benchmarking

Building high-morale organizations and building communication networks that include employees are both elements of A) ISO 9000 certification B) Six Sigma certification C) employee empowerment D) Taguchi methods E) the tools of TQM

C) Employee Empowerment

The upper and lower limits for diving ring diameters made by John's Swimming Co. are 40 and 39 cm., respectively. John took 11 samples with the following average diameters (39, 39.1, 39.2, 39.3, 39.4, 39.5 39.6, 39.7, 39.8, 39.9, Is the process in control? A) Yes, no diameters exceeded the control limits. B) No, some diameters exceeded the control limits. C) No, there is a distinguishable pattern to the samples. D) No, the range is not in control. E) There is not enough information to make a decision

C) No, there is a distinguishable pattern to the samples.

The Central Limit Theorem: A) is the theoretical foundation of the c-chart. B) states that the average of assignable variations is zero. C) allows managers to use the normal distribution as the basis for building some control charts. D) states that the average range can be used as a proxy for the standard deviation. E) controls the steepness of an operating characteristic curve.

C) allows managers to use the normal distribution as the basis for building some control charts.

Companies with the highest levels of quality are how many times more productive than their competitors with the lowest quality levels? A) 2 B) 3 C) 4 D) 5 E) None of the above because quality has no impact on productivity (units/labor hr.).

D) 5

In his book, Safe Patients, Smart Hospitals, Dr. Peter Pronovost emphasizes the use of what tool to reduce catheter infections? A) a Pareto chart B) a flowchart C) a cause-and-effect diagram D) a checklist E) a statistical process control chart

D) A checklist

Which of the following is TRUE regarding the average outgoing quality level? A) An AOQ value of 1 is ideal, because all defects have been removed. B) AOQ is always greater than AQL but less than LTPD. C) AOQ rises (worsens) following inspection of failed lots. D) AOQ is very low (very good) for extremely poor quality lots. E) None of the above is true.

D) AOQ is very low (very good) for extremely poor quality lots.

Suppose that a firm has historically been achieving "Three Sigma" quality. If the firm later changes its quality management practices such that it begins to achieve "Six Sigma" quality, which of the following phenomena will result? A) The average number of defects will be cut in half. B) The specification limits will be moved twice as far from the mean. C) The average number of defects will be cut by 99.9997%. D) The average number of defects will be cut by 99.87%. E) The average number of defects will be cut by 99.73%.

D) The average number of defects will be cut by 99.87%.

A Cp value of 1.33 indicates a standard of how many standard deviations (sigmas)? A) 6 B) 1.33 C) 2 D) 3 E) 4

E) 4

A successful quality strategy features which of the following elements? A) an organizational culture that fosters quality B) an understanding of the principles of quality C) engaging employees in the necessary activities to implement quality D) A and C E) A, B, and C

E) A, B, and C

The process capability measures Cp and Cpk differ because: A) only one ensures the process mean is centered within the limits. B) Cp values above 1 indicate a capable process, while Cpk values above 2 indicate a capable process. C) They do not differ: both are identical. D) Cp values for a given process will always be greater than or equal to Cpk values. E) Both A and D are correct.

E) Both A and D are correct.

Plots of sample ranges indicate that the most recent value is below the lower control limit. What course of action would you recommend? A) Since there is no obvious pattern in the measurements, variability is in control. B) One value outside the control limits is insufficient to warrant any action. C) Lower than expected dispersion is a desirable condition; there is no reason to investigate. D) The process is out of control; reject the last units produced. E) Variation is not in control; investigate what created this condition.

E) Variation is not in control; investigate what created this condition.