Questions from Total Quality Management

Q: The bending strength of the poles is a consideration to a manufacturer

The bending strength of the poles is a consideration to a manufacturer of fiberglass fishing rods. Samples are chosen from the process, and the average bending strength of four samples is found. The t...

Q: Consider the data on purchase order processing time for customers shown in

Consider the data on purchase order processing time for customers shown in Table 4-6. Construct an individuals and a moving-range chart on the data before process improvement changes are made and comm...

Q: Consider the data on the waiting time (seconds) of customers

Consider the data on the waiting time (seconds) of customers before speaking to a representative at a call center, shown in Exercise 5-9. Data from Exercise 5-9: A random sample of 50 observations o...

Q: The time from product inception and design to marketing and sales is

The time from product inception and design to marketing and sales is important for application software in mobile devices. For the last 20 products, Table 7-26 shows such times (in weeks) for a softwa...

Q: The percentage of potassium in a compound is expected to be within

The percentage of potassium in a compound is expected to be within the specification limits of 18–35%. Samples of size 4 are selected, and the mean and range of 25 such samples are s...

Q: Define and explain type I and type II errors in the context

Define and explain type I and type II errors in the context of control charts. Are they related? How does the choice of control limits influence these two errors?

Q: Refer to Exercise 7-38 and the data for the percentage

Refer to Exercise 7-38 and the data for the percentage of potassium content in a compound. Suppose that we wish to detect an out-of-control condition with a probability of 0.90 if the process is produ...

Q: A component to be used in the assembly of a transmission mechanism

A component to be used in the assembly of a transmission mechanism is manufactured in a process for which the two quality characteristics of tensile strength (X1) and diameter (X2) are of importance....

Q: It is desired to monitor project completion times by analysts in a

It is desired to monitor project completion times by analysts in a consulting company. The magnitude and complexity of the project influence the completion time. It is also believed that the variabili...

Q: Consider the data on the parameters in a chemical process of temperature

Consider the data on the parameters in a chemical process of temperature, pressure, proportion of catalyst, and pH value of mixture as indicated in Table 3-15. (a) Construct a Hotellingâ€&#...