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Exam 21: Statistical Methods for Quality Control

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Question 1

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Control charts assist in detecting which type of process?

A) Out of control
B) In statistical control
C) Skewed control
D) None of these alternatives is correct.

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Question 2

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A production process is considered to be in control if it processes at least 97.5% nondefective items. Samples of size 450 are used for the inspection process. Determine the upper and lower control limits for the P chart of defective elements.

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UCL = 0.0471
LCL = 0...

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Question 3

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An estimator of the process standard deviation is the average _____ divided by a constant that depends on the sample size.

Adjustments or changes are necessary when the process is

The upper and lower control limits of the mean of a process are 66 and 54. Samples of size 25 are used for the inspection process. Determine the mean and the standard deviation for this process.

The quality control department of a company has decided to select a sample of 10 items from the shipments received; and if the sample contains no defective parts, the entire shipment will be accepted. a. If four percent of the items in the shipment are defective, what is the probability that the entire shipment will be accepted? b. Use the binomial table and read the probability of accepting shipments that contain 5, 10, 15, 20, 25, 30, 35, 40, 45, and 50% defective units.

The three quality processes on which Juran's approach to quality focused include all of the following except quality

When a Motorola executive said "That evaluation is …. perhaps the most cost-effective, value-added business consultation available anywhere in the world today" he was referring to​

In quality control terminology, the group of items being considered based on specified quality characteristics is called a

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

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

A(n) _____ chart is used to monitor the range of measurements in the sample.

Variations in process output that are due to factors in the production process such as machine tools wearing out are _____ causes.

The null hypothesis assumes that production process is

The Malcolm Baldrige National Quality Award was established in

In contrast to Deming's philosophy, which required a major cultural change in the organization, Juran's programs were designed to improve quality by​

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

The process mean and standard deviation can be estimated by using samples that are selected from the process when​

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

We can examine the effect of the sampling plan on both types of risks by varying the assumed​