Question 1

The sample result plotted on an np control chart is

Accepted Answer

A) np 
B) np 
C) the number of perfect units in the sample 
D) the number of defective units in the sample

Question 2

A control chart used when the output of a process is measured in terms of the mean value of a variable such as a length, weight, temperature, and so on is

Accepted Answer

A) a p chart 
B) an x-bar chart 
C) an R chart 
D) an np chart

Question 3

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

Accepted Answer

A) common-cause variation 
B) assignable-cause variation 
C) control-cause variation 
D) correctable-cause variation

Question 4

Juran proposed a simple definition of quality:

Accepted Answer

A) customer satisfaction 
B) conformance to specifications 
C) fitness for use 
D) commitment to excellence

Question 5

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

Accepted Answer

A) percentage of defective items in the lot 
B) number of defective items in the sample 
C) probability of accepting the lot 
D) number of units in the lot

Question 6

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?

Accepted Answer

The answer of The No-Cal Bottling Company bottles soft drinks...

Question 7

The following data represent the filling weights based on samples of 350-gram containers. Ten samples of size 5 were taken. Use Excel to develop an x-bar chart.

Accepted Answer

The answer of The following data represent the filling weights...

Question 8

A process that is in control has a mean of F1F1F1S1F1F1F10 = 56.5 and a standard deviation of F1F1F1S1F1F1F10 = 3.4. What should the control limits be for a sample mean chart if samples of size 8 are taken?

Accepted Answer

The answer of A process that is in control has...

Question 9

The control limits for an x-bar chart are how many standard deviations above and below the process mean?

Accepted Answer

A) one 
B) two 
C) three 
D) four

Question 10

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

Accepted Answer

A) single-sample plan 
B) multiple-sampling plan 
C) multinomial sampling plan 
D) None of the other answers is correct.

Question 11

A production process is considered in control if 4% of the items produced are defective. Samples of size 100 are used for the inspection process.
a.Determine the standard error of the proportion.
b.Determine the upper and the lower control limits for the p chart.

Accepted Answer

The answer of A production process is considered in control...

Question 12

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?

Accepted Answer

The answer of The weight of bags of cement filled...

Question 13

The control limits for a p chart are how many standard deviations above and below the proportion defective?

Accepted Answer

A) one 
B) two 
C) three 
D) four

Question 14

A control chart that is used when the output of a production process is measured in terms of the proportion defective is

Accepted Answer

A) a p chart 
B) an x-bar chart 
C) an R chart 
D) an np chart

Question 15

A process sampled 30 times with a sample of size nine resulted in  = 12.7 and  = 0.8. Compute the upper and lower control limits for the  and  charts for this process.

Accepted Answer

The answer of A process sampled 30 times with a...

Question 16

An acceptance sampling plan with n = 20 and c = 1 has been designed with a producer's risk of .12. a. Was the value of p₀ equal to .02, .03, .04, or .05? b. What is the consumer's risk associated with this plan if p₁ is .08? c. Assume the consumer's risk found in (b) is unacceptably high. Which modification of the sampling plan will result in the greater reduction of the consumer's risk, increasing n to 30 or decreasing c to 0?

Accepted Answer

The answer of An acceptance sampling plan with n =...

Question 17

A control chart that is used to monitor the number of defectives in a sample is

Accepted Answer

A) a p chart 
B) an x-bar chart 
C) an R chart 
D) an np chart

Question 18

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

Accepted Answer

A) statistical process control 
B) acceptance sampling 
C) Both statistical process control and acceptance sampling are correct. 
D) None of the other answers is correct.

Question 19

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

Accepted Answer

A) working within the current organizational system 
B) reducing the number of levels in the organizational structure 
C) changing customer perception and expectations 
D) identifying and replacing the most counter-productive employees

Question 20

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

Accepted Answer

A) x1 > c1 
B) c1 1 2 
C) x1 > c2 
D) x1 > c1 + c2

Exam 14: Statistical Methods for Quality Control

The sample result plotted on an np control chart is

A control chart used when the output of a process is measured in terms of the mean value of a variable such as a length, weight, temperature, and so on is

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

Juran proposed a simple definition of quality:

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

The following data represent the filling weights based on samples of 350-gram containers. Ten samples of size 5 were taken. Use Excel to develop an x-bar chart.

A process that is in control has a mean of  = 56.5 and a standard deviation of  = 3.4. What should the control limits be for a sample mean chart if samples of size 8 are taken?

The control limits for an x-bar chart are how many standard deviations above and below the process mean?

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

A production process is considered in control if 4% of the items produced are defective. Samples of size 100 are used for the inspection process. a.Determine the standard error of the proportion. b.Determine the upper and the lower control limits for the p chart.

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?

The control limits for a p chart are how many standard deviations above and below the proportion defective?

A control chart that is used when the output of a production process is measured in terms of the proportion defective is

A process sampled 30 times with a sample of size nine resulted in = 12.7 and = 0.8. Compute the upper and lower control limits for the and charts for this process.

A control chart that is used to monitor the number of defectives in a sample is

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

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

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