Question 1

One reason some companies fail in their attempt to apply statistical process control is lack of training.

Accepted Answer

A) True 
 B)False

Question 2

Control charts are never implemented until special cause variation has been detected in a process.

Accepted Answer

A) True 
 B)False

Question 3

Control charts visually show when a process is not within statistical control limits.

Accepted Answer

A) True 
 B)False

Question 4

The consumer's risk is the probability of accepting a lot in which the fraction of defective items exceeds the lot tolerance percent defective (LTPD).

Accepted Answer

A) True 
 B)False

Question 5

Discuss the rationale and procedure for the initial construction of a control chart.

Accepted Answer

The answer of Discuss the rationale and procedure for the...

Question 6

Which of the following is not a characteristic of a control chart?

Accepted Answer

A)  The centre line is determined using special cause variations. 
B)  The upper and lower control limits are based on special cause variation. 
C)  The centre line is determined by using the target value. 
D)  None of the above are true.

Question 7

Briefly discuss attribute and qualitative variable quality measures.

Accepted Answer

The answer of Briefly discuss attribute and qualitative variable quality...

Question 8

A sequence of sample points that display a pattern is known as a run.

Accepted Answer

A) True 
 B)False

Question 9

Acceptance sampling is still used today for all the following reasons except

Accepted Answer

A)  government regulations. 
B)  contractual requirements. 
C)  industry standards. 
D)  total quality management principles.

Question 10

Acceptance sampling involves the inspection of a non-random sample of units selected from a lot.

Accepted Answer

A) True 
 B)False

Question 11

Consider the number of patient falls per day in a hospital. Which of the following control charts is most applicable in this case?

Accepted Answer

A)   
B)  R 
C)  c 
D)  p

Question 12

A company randomly selects 100 light bulbs every day for 40 days from its production process. If 600 defective light bulbs are found in the sampled bulbs then the estimate for the process average defective would be

Accepted Answer

A)  6.667. 
B)  0.167. 
C)  0.150. 
D)  0.250.

Question 13

After collecting a new sample and determining its average, which of the following should NOT be done?

Accepted Answer

A)  Recalculate the control chart with the new information. 
B)  Plot the sample average into the existing control chart. 
C)  Check whether the new sample gives reason to believe that the process is not in control. 
D)  If the sample average is above the upper control limit, the process should be investigated.

Question 14

Four common types of control charts include all of the following except

Accepted Answer

A)   -chart 
B)  t-chart 
C)  p-chart 
D)  c-chart

Question 15

If a sample of 40 units of output found 500 defects, then the 3-sigma upper control limit for the  chart would be

Accepted Answer

A)  12.5. 
B)  23.11. 
C)  37.5. 
D)  75.0.

Question 16

With a c-chart, the sample size is small and often contains only one item.

Accepted Answer

A) True 
 B)False

Question 17

The goal of statistical process control is to ensure that the control limits and specifications limits for a process always remain the same.

Accepted Answer

A) True 
 B)False

Question 18

A quantitative variable classifies while a qualitative variable (attribute) measures.

Accepted Answer

A) True 
 B)False

Question 19

The probability of accepting a lot that has a higher percentage of defective items than the lot tolerance percent defective is referred to as the

Accepted Answer

A)  producer's risk. 
B)  sampling plan. 
C)  consumer's risk. 
D)  average outgoing quality.

Question 20

The process capability index indicates how much a process mean differs from the target specification value.

Accepted Answer

A) True 
 B)False

Exam 3: Statistical Process Control

One reason some companies fail in their attempt to apply statistical process control is lack of training.

Control charts are never implemented until special cause variation has been detected in a process.

Control charts visually show when a process is not within statistical control limits.

The consumer's risk is the probability of accepting a lot in which the fraction of defective items exceeds the lot tolerance percent defective (LTPD).

Discuss the rationale and procedure for the initial construction of a control chart.

Which of the following is not a characteristic of a control chart?

Briefly discuss attribute and qualitative variable quality measures.

A sequence of sample points that display a pattern is known as a run.

Acceptance sampling is still used today for all the following reasons except

Acceptance sampling involves the inspection of a non-random sample of units selected from a lot.

Consider the number of patient falls per day in a hospital. Which of the following control charts is most applicable in this case?

A company randomly selects 100 light bulbs every day for 40 days from its production process. If 600 defective light bulbs are found in the sampled bulbs then the estimate for the process average defective would be

After collecting a new sample and determining its average, which of the following should NOT be done?

Four common types of control charts include all of the following except

If a sample of 40 units of output found 500 defects, then the 3-sigma upper control limit for the chart would be

With a c-chart, the sample size is small and often contains only one item.

The goal of statistical process control is to ensure that the control limits and specifications limits for a process always remain the same.

A quantitative variable classifies while a qualitative variable (attribute) measures.

The probability of accepting a lot that has a higher percentage of defective items than the lot tolerance percent defective is referred to as the

The process capability index indicates how much a process mean differs from the target specification value.