Question 1

Lots are defined as low quality when the percentage of defective units is greater than what? ________________________________________

Accepted Answer

lot tolerance percent defective (LTPD
Explanation: Lots are defined as low quality if the percentage of defectives is greater than a specified amount, termed lot tolerance percent defective (LTPD).

Question 2

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.Which of the following is your LCL?

Accepted Answer

A) 36 
B) 24 
C) 9.68 
D) 16.79 
E) 30.32 
A) 36 
B) 24 
C) 9.68 
D) 16.79 
E) 30.32 C

Question 3

In acceptance sampling, the value for the acceptance number (c) 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  True

Question 4

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.Which of the following is your UCL?

Accepted Answer

A) 36 
B) 24 
C) 12 
D) 4 
E) None of these 
A) 36 
B) 24 
C) 12 
D) 4 
E) None of these

Question 5

You have just used the capability index (Cpk) formulas to compute the two values "min [1, 1]." Which of the following is the proper interpretation of these numbers?

Accepted Answer

A) The true capability index value is exactly 1. 
B) The mean of the production process has shifted to the left of the design limits. 
C) The mean of the production process has shifted to the right of the design limits. 
D) The mean has not shifted at all. 
E) None of these 
A) The true capability index value is exactly 1. 
B) The mean of the production process has shifted to the left of the design limits. 
C) The mean of the production process has shifted to the right of the design limits. 
D) The mean has not shifted at all. 
E) None of these

Question 6

Measurement by attributes means taking a sample, measuring the attribute in question, and determining the level of quality in the population from which the sample was drawn.

Accepted Answer

A) True 
 B)False

Question 7

What is the symbol designating the capability index? ______________________________

Accepted Answer

Cpk
Explanation: The capabilit

Question 8

You want to develop a three-sigma R-chart.You know the average range is 12 based on several samples of size 6.Which of the following is the resulting LCL?

Accepted Answer

A) 20.0 
B) 18.3 
C) 7.02 
D) 5.6 
E) 0.0 
A) 20.0 
B) 18.3 
C) 7.02 
D) 5.6 
E) 0.0

Question 9

One hundred percent inspection is justified when the cost of inspection is low.

Accepted Answer

A) True 
 B)False

Question 10

You are going to develop an R-chart based on range statistics, and you are using a sample size of 15 for your charting purposes.Which of the following is the upper control limit D4 factor for the chart?

Accepted Answer

A) 1.65 
B) 1.70 
C) 1.76 
D) 1.87 
E) 1.92 
A) 1.65 
B) 1.70 
C) 1.76 
D) 1.87 
E) 1.92

Question 11

You have just used the capability index (Cpk) formulas to compute the two values "min [1.5, 1]." Which of the following is the interpretation of these numbers?

Accepted Answer

A) The true capability index value is 1. 
B) The mean of the production process has shifted to the left of the design limits. 
C) The mean of the production process has shifted to the right of the design limits. 
D) The mean has not shifted at all. 
E) The true capability index value is between 1.5 and 1. 
A) The true capability index value is 1. 
B) The mean of the production process has shifted to the left of the design limits. 
C) The mean of the production process has shifted to the right of the design limits. 
D) The mean has not shifted at all. 
E) The true capability index value is between 1.5 and 1.

Question 12

Attributes are those quality characteristics that are classified as either conforming or not conforming to specification.

Accepted Answer

A) True 
 B)False

Question 13

You want to develop a three-sigma R-chart.You know the average range is 12 based on several samples of size 6.Which of the following is the resulting LCL? ___________________________________

Accepted Answer

zero
Explanation: Fr

Question 14

Standard practice in statistical process control for variables is to set control limits so that 95 percent of the sample means will fall within the UCL and the LCL.

Accepted Answer

A) True 
 B)False

Question 15

The probability associated with rejecting a high-quality lot is denoted in acceptance sampling with the Greek letter alpha.

Accepted Answer

A) True 
 B)False

Question 16

You want to develop a three-sigma R-chart.You know the average range is 5 based on several samples of size 10.Which of the following is the resulting UCL?

Accepted Answer

A) 20.9 
B) 8.9 
C) 7.02 
D) 5 
E) 3.1 
A) 20.9 
B) 8.9 
C) 7.02 
D) 5 
E) 3.1

Question 17

You have 75 total defects from 100 different samples of 15.What is p-bar? _______________________________

Accepted Answer

0.05
Explanation: p-bar = Frac

Question 18

LTPD in acceptance sampling stands for lot tolerance for parts defective.

Accepted Answer

A) True 
 B)False

Question 19

Process control is concerned with monitoring quality after the product or service has been produced.

Accepted Answer

A) True 
 B)False

Question 20

You are going to develop an X-bar chart based on range statistics, and you are using a sample size of 12 for your charting purposes.Which of the following is the A2 factor for the X-bar chart?

Accepted Answer

A) 0.37 
B) 0.31 
C) 0.27 
D) 0.22 
E) 0.18 
A) 0.37 
B) 0.31 
C) 0.27 
D) 0.22 
E) 0.18

Exam 13: Statistical Quality Control

Lots are defined as low quality when the percentage of defective units is greater than what? ________________________________________

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.Which of the following is your LCL?

In acceptance sampling, the value for the acceptance number (c) 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).

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.Which of the following is your UCL?

You have just used the capability index (Cpk) formulas to compute the two values "min [1, 1]." Which of the following is the proper interpretation of these numbers?

Measurement by attributes means taking a sample, measuring the attribute in question, and determining the level of quality in the population from which the sample was drawn.

What is the symbol designating the capability index? ______________________________

You want to develop a three-sigma R-chart.You know the average range is 12 based on several samples of size 6.Which of the following is the resulting LCL?

One hundred percent inspection is justified when the cost of inspection is low.

You are going to develop an R-chart based on range statistics, and you are using a sample size of 15 for your charting purposes.Which of the following is the upper control limit D4 factor for the chart?

You have just used the capability index (Cpk) formulas to compute the two values "min [1.5, 1]." Which of the following is the interpretation of these numbers?

Attributes are those quality characteristics that are classified as either conforming or not conforming to specification.

You want to develop a three-sigma R-chart.You know the average range is 12 based on several samples of size 6.Which of the following is the resulting LCL? ___________________________________

Standard practice in statistical process control for variables is to set control limits so that 95 percent of the sample means will fall within the UCL and the LCL.

The probability associated with rejecting a high-quality lot is denoted in acceptance sampling with the Greek letter alpha.

You want to develop a three-sigma R-chart.You know the average range is 5 based on several samples of size 10.Which of the following is the resulting UCL?

You have 75 total defects from 100 different samples of 15.What is p-bar? _______________________________

LTPD in acceptance sampling stands for lot tolerance for parts defective.

Process control is concerned with monitoring quality after the product or service has been produced.

You are going to develop an X-bar chart based on range statistics, and you are using a sample size of 12 for your charting purposes.Which of the following is the A2 factor for the X-bar chart?

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You are going to develop an X-bar chart based on range statistics, and you are using a sample size of 12 for your charting purposes.Which of the following is the A₂ factor for the X-bar chart?