Question 1

The value for "z" used in quality control charts is based on the degree of confidence you want to have in the resulting UCL and LCL values.

Accepted Answer

A) True 
 B)False

Question 2

You want to determine the control lines for a p-chart for quality control purposes.If the desired confidence level is 99 percent, which of the following values for "z" would you use in computing the UCL and LCL?

Accepted Answer

A) 0.99 
B) 2 
C) 2.58 
D) 3 
E) None of these 
A) 0.99 
B) 2 
C) 2.58 
D) 3 
E) None of these

Question 3

You want to determine the lower control line for a p-chart for quality control purposes.You take several samples of a size of 50 items in your production process.From the samples, you determine the fraction defective is 0.006 and the standard deviation is 0.001.If the desired confidence level is 99.7 percent, which of the following is the resulting LCL value for the line?

Accepted Answer

A) 0.0 
B) 0.002 
C) 0.003 
D) 0.004 
E) None of these 
A) 0.0 
B) 0.002 
C) 0.003 
D) 0.004 
E) None of these

Question 4

If the fraction defective is 0.12 based on a sample size of 16, what is the standard deviation to be used when constructing a p-chart? ___________________________________

Accepted Answer

0.081
Explanation: The standard deviatio

Question 5

Variation that is inherent in a production process itself is called assignable variation.

Accepted Answer

A) True 
 B)False

Question 6

Quality control charts usually have a central line and upper and lower control limit lines.Which of the following is not a reason that the process being monitored with the chart should be investigated?

Accepted Answer

A) A large number of plots are close to the upper or lower control lines. 
B) The behavior of the plots is erratic. 
C) A single plot falls above or below the control limits. 
D) Thee is a change in raw materials or operators. 
E) There is a run of five above the central line. 
A) A large number of plots are close to the upper or lower control lines. 
B) The behavior of the plots is erratic. 
C) A single plot falls above or below the control limits. 
D) Thee is a change in raw materials or operators. 
E) There is a run of five above the central line.

Question 7

In acceptance sampling, the number of units in the sample (n) is determined by the interaction of the acceptable quality level (AQL), the lot tolerance percent defective (LTPD), the probability of rejecting a high-quality lot (alpha), and the probability of accepting a low-quality lot (beta).

Accepted Answer

A) True 
 B)False

Question 8

The capability index (Cpk) calculates the percentage of items being produced within specifications.

Accepted Answer

A) True 
 B)False

Question 9

If there are 120 total defects from 10 samples, each sample consisting of 10 individual items in a production process, which of the following is the fraction defective that can be used in a p-chart for quality control purposes?

Accepted Answer

A) 120 
B) 10 
C) 8 
D) 1.2 
E) 0.8 
A) 120 
B) 10 
C) 8 
D) 1.2 
E) 0.8

Question 10

For which of the following should we use a p-chart to monitor process quality?

Accepted Answer

A) Defective electrical switches 
B) Errors in the length of a pencil 
C) Weight errors in cans of soup 
D) Temperature of entrees in a restaurant 
E) Letter grades on a final examination 
A) Defective electrical switches 
B) Errors in the length of a pencil 
C) Weight errors in cans of soup 
D) Temperature of entrees in a restaurant 
E) Letter grades on a final examination

Question 11

If the fraction defective is 0.4 based on a sample size of 100, what is the standard deviation used in constructing the p-chart? _____________________________________

Accepted Answer

0.049
Explanation: The standard deviatio

Question 12

You are developing an X-bar chart based on sample means.You know the standard deviation of the sample means is 4, the desired confidence level is 99 percent, and the average of the sample means is 20.What is your LCL? _________________________________________

Accepted Answer

The answer of You are developing an X-bar chart based...

Question 13

If there are 400 total defects from 8 samples, each sample consisting of 20 individual items in a production process, which of the following is the fraction defective that can be used in a p-chart for quality control purposes?

Accepted Answer

A) 400 
B) 160 
C) 2.5 
D) 1.0 
E) 0.4 
A) 400 
B) 160 
C) 2.5 
D) 1.0 
E) 0.4

Question 14

You are developing an X-bar chart based on sample means.You know the standard deviation of the sample means is 4, the desired confidence level is 99.7 percent, and the average of the sample means is 24.What is your UCL? ________________________________________

Accepted Answer

The answer of You are developing an X-bar chart based...

Question 15

Quality control charts usually have a central line and upper and lower control limit lines.Which of the following is a reason that the process being monitored with the chart should be investigated?

Accepted Answer

A) A single plot falls above or below the control limits. 
B) Behavior is normal. 
C) A large number of plots are on or near the central line. 
D) There is no real trend in any direction. 
E) There is a change in raw materials or operators. 
A) A single plot falls above or below the control limits. 
B) Behavior is normal. 
C) A large number of plots are on or near the central line. 
D) There is no real trend in any direction. 
E) There is a change in raw materials or operators.

Question 16

The p-chart is only useful for sampling that deals with continuous variables.

Accepted Answer

A) True 
 B)False

Question 17

AQL stands for accepting questionable lots in production quality management.

Accepted Answer

A) True 
 B)False

Question 18

In variables sampling, the actual measurements of the variable observed are used regardless of whether the unit is good or bad.

Accepted Answer

A) True 
 B)False

Question 19

You want to determine the upper control line for a p-chart for quality control purposes.You take several samples of a size of 100 items in your production process.From the samples, you determine the fraction defective is 0.05 and the standard deviation is 0.01.If the desired confidence level is 99.7 percent, which of the following is the resulting UCL value for the line?

Accepted Answer

A) 0.39 
B) 0.08 
C) 0.06 
D) 0.05 
E) None of these 
A) 0.39 
B) 0.08 
C) 0.06 
D) 0.05 
E) None of these

Question 20

For which of the following should we use an X-bar chart based on sample means to monitor process quality?

Accepted Answer

A) Grades in a freshman "pass/fail" course 
B) Tire pressures in an auto assembly plant 
C) Vehicles passing emissions inspection 
D) Computer software errors 
E) Number of units with missing operations 
A) Grades in a freshman "pass/fail" course 
B) Tire pressures in an auto assembly plant 
C) Vehicles passing emissions inspection 
D) Computer software errors 
E) Number of units with missing operations

Exam 13: Statistical Quality Control

The value for "z" used in quality control charts is based on the degree of confidence you want to have in the resulting UCL and LCL values.

You want to determine the control lines for a p-chart for quality control purposes.If the desired confidence level is 99 percent, which of the following values for "z" would you use in computing the UCL and LCL?

If the fraction defective is 0.12 based on a sample size of 16, what is the standard deviation to be used when constructing a p-chart? ___________________________________

Variation that is inherent in a production process itself is called assignable variation.

Quality control charts usually have a central line and upper and lower control limit lines.Which of the following is not a reason that the process being monitored with the chart should be investigated?

In acceptance sampling, the number of units in the sample (n) is determined by the interaction of the acceptable quality level (AQL), the lot tolerance percent defective (LTPD), the probability of rejecting a high-quality lot (alpha), and the probability of accepting a low-quality lot (beta).

The capability index (Cpk) calculates the percentage of items being produced within specifications.

If there are 120 total defects from 10 samples, each sample consisting of 10 individual items in a production process, which of the following is the fraction defective that can be used in a p-chart for quality control purposes?

For which of the following should we use a p-chart to monitor process quality?

If the fraction defective is 0.4 based on a sample size of 100, what is the standard deviation used in constructing the p-chart? _____________________________________

You are developing an X-bar chart based on sample means.You know the standard deviation of the sample means is 4, the desired confidence level is 99 percent, and the average of the sample means is 20.What is your LCL? _________________________________________

If there are 400 total defects from 8 samples, each sample consisting of 20 individual items in a production process, which of the following is the fraction defective that can be used in a p-chart for quality control purposes?

You are developing an X-bar chart based on sample means.You know the standard deviation of the sample means is 4, the desired confidence level is 99.7 percent, and the average of the sample means is 24.What is your UCL? ________________________________________

Quality control charts usually have a central line and upper and lower control limit lines.Which of the following is a reason that the process being monitored with the chart should be investigated?

The p-chart is only useful for sampling that deals with continuous variables.

AQL stands for accepting questionable lots in production quality management.

In variables sampling, the actual measurements of the variable observed are used regardless of whether the unit is good or bad.

For which of the following should we use an X-bar chart based on sample means to monitor process quality?

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