Questions from Total Quality Management

Q: Consider Exercise 5-27 and suppose that a cluster sample is

Consider Exercise 5-27 and suppose that a cluster sample is chosen, where the randomly groups selected are 2 and 3. The total of all observations from group 2 is $7,100,000, while that from group 3 is...

Q: Explain some causes that would make the control chart pattern follow a

Explain some causes that would make the control chart pattern follow a gradually increasing trend.

Q: What is meant by an overall type I error rate? If

What is meant by an overall type I error rate? If Rules 1, 2, and 3 of this chapter are used simultaneously, assuming independence, what is the probability of an overall type I error if 3σ control lim...

Q: The diameter of a part produced by an automatic machine is a

The diameter of a part produced by an automatic machine is a characteristic of interest. Based on historical data, the process average diameter is 15 mm with a process standard deviation of 0.8 mm. If...

Q: The length of industrial filters is a quality characteristic of interest.

The length of industrial filters is a quality characteristic of interest. Thirty samples, each of size 5, are chosen from the process. The data yield an average length of 110 mm, with the process stan...

Q: The tensile strength of nonferrous pipes is of importance. Samples of

The tensile strength of nonferrous pipes is of importance. Samples of size 5 are selected from the process output, and their tensile strength values are found. After 30 such samples, the process mean...

Q: Suppose 3σ control limits are constructed for the average temperature in a

Suppose 3σ control limits are constructed for the average temperature in a furnace. Samples of size 4 were selected with the average temperature being 5000°C and a standard deviation of 50°C. (a) Find...

Q: A manager is contemplating using Rules 1 and 4 for determining out

A manager is contemplating using Rules 1 and 4 for determining out-of-control conditions. Suppose that the manager constructs 3σ limits. (a) What is the overall type I error probability assuming indep...

Q: The time to deliver packaged containers by a logistics company is found

The time to deliver packaged containers by a logistics company is found from samples of size 4. The mean and standard deviation of delivery times is estimated to be 140 hours and 6 hours, respectively...

Q: A health care facility is monitoring daily expenditures for a certain diagnosis

A health care facility is monitoring daily expenditures for a certain diagnosis-related group (DRG). Individual observations are selected. After 50 samples, the average and standard deviation of daily...