Exam 19: Statistical Methods for Quality Control

Consumer's risk is

Brakes Shop, Inc. is a franchise that specializes in repairing brake systems of automobiles. The company purchases brake shoes from a national supplier. Currently, lots of 1,000 brake shoes are purchased, and each shoe is inspected before being installed on an automobile. The company has decided, instead of 100% inspection, to adopt an acceptance sampling plan. a.Explain what is meant by the acceptance sampling plan. b.If the company decides to adopt an acceptance sampling plan, what kinds of risks are there? c.The quality control department of the company has decided to select a sample of 10 shoes and inspect them for defects. Furthermore, it has been decided that if the sample contains no defective parts, the entire lot will be accepted. If there are 50 defective shoes in a shipment, what is the probability that the entire lot will be accepted? d.What is the probability of accepting the lot if there are 100 defective units in the lot?

Juran proposed a simple definition of quality:

Which of the following observed on a control chart suggests a process that is not in control?

The entire system of policies, procedures, and guidelines established by an organization to achieve and maintain quality is called

Normal or natural variation in the quality of production output that is due purely to chance is called

Ledd Electronics has received a large shipment of power supply units for the desktop computers being assembled. The units are coming from a new supplier and Ledd is not sure what the actual defect rate will be for this component. Ledd is considering an acceptance sampling plan with n = 30 and c = 1. a. Find the probability of accepting a lot when the defect rate is 2%, 4%, and 6%. b. What happens to the producer's risk as the defect rate increases? c. What happens to the consumer's risk as the defect rate increases?

Quality assurance consists of

The No-Cal Bottling Company bottles soft drinks for sale to government commissaries. The bottles come in only one flavor (chocolate-lemon) and only one size (32 ounces). Joan Stickler, the quality control officer for the commissaries, wants to keep track of the fill weights of No-Cal and begins to draw daily samples of 100 bottles from the daily receipts. The first ten sample means and ranges are: If sample ranges ordinarily average 2.5 ounces: a. Compute 3s control limits for sample means. b. Compute 3s control limits for sample ranges. c. What would you conclude about the fill weights of NoCal?

A graphical tool used to help determine whether a process is in control or out of control is a

Which of the following is a statistical method used in quality control?

The Malcolm Baldrige National Quality Award was established in

Control charts that are based on data indicating the presence of a defect or the number of defects are called ______ control charts.

The sample result plotted on a p chart is the

In acceptance sampling, the risk of rejecting a good quality lot is known as

If the value of c in a single-stage acceptance sampling plan is increased, with n remaining constant, the probability of accepting the lot

The second stage of a two-stage acceptance sampling plan is executed when the first-stage result is

The weight of bags of cement filled by Granite Rock Company's packaging process is normally distributed with a mean of 50 pounds and a standard deviation of 1.5 pounds when the process is in control. What should the control limits be for a sample mean, , chart if 9 bags are sampled at a time?

A form of acceptance sampling in which more than one sample or stage is used is called a

Heavy emphasis on statistical analysis and careful measurement are closely associated with