Question 1

A Type I error occurs when:

Accepted Answer

A) a good lot is rejected. 
B) a bad lot is accepted. 
C) the number of defectives is very large. 
D) the population is worse than the AQL. 
E) none of the above 
A) a good lot is rejected. 
B) a bad lot is accepted. 
C) the number of defectives is very large. 
D) the population is worse than the AQL. 
E) none of the above

Question 2

A retail store manager is trying to improve and control the rate at which cashiers sign customers up
for store credit cards.The manager takes several samples of size 50.He finds that each sample of 50 contained 5 credit card signups on average.Find p-bar and 99.73% control limits.

Accepted Answer

P-bar = 5/50 = .1 or 10%.Sigma-p = sqrt(

Question 3

An operator trainee is attempting to monitor a filling process that has an overall average of 705 cc.The average range is 17 cc.If you use a sample size of 6,what are the upper and lower control limits for the x-bar chart and R-chart?

Accepted Answer

From the table,A2 = 0.483,D4 =

Question 4

A run test is used:

Accepted Answer

A) to examine variability in acceptance sampling plans. 
B) in acceptance sampling to establish control. 
C) to examine points in a control chart to check for natural variability. 
D) to examine points in a control chart to check for nonrandom variability. 
E) to test the validity of the Central Limit Theorem. 
A) to examine variability in acceptance sampling plans. 
B) in acceptance sampling to establish control. 
C) to examine points in a control chart to check for natural variability. 
D) to examine points in a control chart to check for nonrandom variability. 
E) to test the validity of the Central Limit Theorem.

Question 5

The number of defects after a hotel room cleaning (sheets not straight,smears on mirror,missed debris on carpet,etc)should be measured using what type of control chart?

Accepted Answer

A) x-bar chart 
B) R-chart 
C) p-chart 
D) c-chart 
E) either x-bar chart or R chart 
A) x-bar chart 
B) R-chart 
C) p-chart 
D) c-chart 
E) either x-bar chart or R chart

Question 6

If the process average is in control,then the process range must also be in control.

Accepted Answer

A) True 
 B)False

Question 7

The specifications for a manifold gasket that installs between two engine parts calls for a thickness of 2.500 mm ± .020 mm.The standard deviation of the process is estimated to be 0.004 mm.The process is currently operating at a mean thickness of 2.50 mm.(a)What are the upper and lower specification limits for this product? (b)What is the Cp for this process? (c)About what percent of all units of this gasket will meet specifications? Does this meet the technical definition of Six Sigma?

Accepted Answer

(a)LSL = 2.48 mm,USL = 2.52 mm. (b)Cp =

Question 8

Pierre's Motorized Pirogues and Mudboats is setting up an acceptance sampling plan for the special air cleaners he manufactures for his boats.His specifications,and the resulting plan,are shown on the POM for Windows output below.In relatively plain English (someone else will translate for Pierre),explain exactly what he will do when performing the acceptance sampling procedure,and what actions he might take based on the results.

Accepted Answer

Pierre should select samples of size 175

Question 9

A normal distribution is generally described by its two parameters: the mean and the range.

Accepted Answer

A) True 
 B)False

Question 10

An acceptance sampling plan is to be designed to meet the organization's targets for product quality and risk levels.Which of the following is true?

Accepted Answer

A) n and c determine the AQL. 
B) AQL,LTPD,α and β collectively determine n and c. 
C) n and c are determined from the values of AQL and LTPD. 
D) α and β are determined from the values of AQL and LTPD. 
E) None of the above is true. 
A) n and c determine the AQL. 
B) AQL,LTPD,α and β collectively determine n and c. 
C) n and c are determined from the values of AQL and LTPD. 
D) α and β are determined from the values of AQL and LTPD. 
E) None of the above is true.

Question 11

The ________ is a quality control chart used to control the number of defects per unit of output.

Accepted Answer

The answer of The ________ is a quality control chart...

Question 12

The normal application of a p-chart is in:

Accepted Answer

A) process sampling by variables. 
B) acceptance sampling by variables. 
C) process sampling by attributes. 
D) acceptance sampling by attributes. 
E) process capability ratio computations. 
A) process sampling by variables. 
B) acceptance sampling by variables. 
C) process sampling by attributes. 
D) acceptance sampling by attributes. 
E) process capability ratio computations.

Question 13

An x-bar control chart was examined and no data points fell outside of the limits.Can this process be considered in control?

Accepted Answer

A) Not yet,there could be a pattern to the points. 
B) Not yet,the R-chart must be checked. 
C) Not yet,the number of samples must be known. 
D) Yes. 
E) Both A and B 
A) Not yet,there could be a pattern to the points. 
B) Not yet,the R-chart must be checked. 
C) Not yet,the number of samples must be known. 
D) Yes. 
E) Both A and B

Question 14

At your first job out of college you have been assigned to the production of bottled 20 oz.soda.
The process has upper and lower spec limits of 20.5 and 19.5 oz,respectively,with a mean of 19.8 oz
and standard deviation of .1 oz.Your manager has requested the process produce no more than 3.4
defects per 1 million bottles produced.Calculate Cpk and then determine if the process is capable according to the manager's standard.

Accepted Answer

Cpk = minimum [(20.5 - 19.8)/(3*.1), (19

Question 15

The specifications for a manifold gasket that installs between two engine parts calls for a thickness of 2.500 mm ± .020 mm.The standard deviation of the process is estimated to be 0.004 mm.The process is currently operating at a mean thickness of 2.50 mm.(a)What are the upper and lower specification limits for this product? (b)What is the Cp for this process? (c)The purchaser of these parts requires a capability index of 1.50.Is this process capable? Is this process good enough for the supplier? (d)If the process mean were to drift from its setting of 2.500 mm to a new mean of 2.497,would the process still be good enough for the supplier's needs?

Accepted Answer

(a)LSL = 2.48 mm,USL = 2.52 mm. (b)Cp =

Question 16

A Cp value of 1.33 indicates a standard of how many standard deviations (sigmas)?

Accepted Answer

A) 6 
B) 1.33 
C) 2 
D) 3 
E) 4 
A) 6 
B) 1.33 
C) 2 
D) 3 
E) 4

Question 17

Acceptance sampling accepts or rejects an entire lot based on the information contained in the sample.

Accepted Answer

A) True 
 B)False

Question 18

The ________ is a quality control chart that indicates when changes occur in the central tendency of a production process.

Accepted Answer

The answer of The ________ is a quality control chart...

Question 19

A Type II error occurs when:

Accepted Answer

A) a good lot is rejected. 
B) a bad lot is accepted. 
C) the population is worse than the LTPD. 
D) the proportion of defectives is very small. 
E) none of the above 
A) a good lot is rejected. 
B) a bad lot is accepted. 
C) the population is worse than the LTPD. 
D) the proportion of defectives is very small. 
E) none of the above

Question 20

Control charts for variables are based on data that come from:

Accepted Answer

A) acceptance sampling. 
B) individual items. 
C) averages of small samples. 
D) averages of large samples. 
E) the entire lot. 
A) acceptance sampling. 
B) individual items. 
C) averages of small samples. 
D) averages of large samples. 
E) the entire lot.

Exam 20: Statistical Process Control

A Type I error occurs when:

A retail store manager is trying to improve and control the rate at which cashiers sign customers up for store credit cards.The manager takes several samples of size 50.He finds that each sample of 50 contained 5 credit card signups on average.Find p-bar and 99.73% control limits.

An operator trainee is attempting to monitor a filling process that has an overall average of 705 cc.The average range is 17 cc.If you use a sample size of 6,what are the upper and lower control limits for the x-bar chart and R-chart?

A run test is used:

The number of defects after a hotel room cleaning (sheets not straight,smears on mirror,missed debris on carpet,etc)should be measured using what type of control chart?

If the process average is in control,then the process range must also be in control.

A normal distribution is generally described by its two parameters: the mean and the range.

An acceptance sampling plan is to be designed to meet the organization's targets for product quality and risk levels.Which of the following is true?

The ________ is a quality control chart used to control the number of defects per unit of output.

The normal application of a p-chart is in:

An x-bar control chart was examined and no data points fell outside of the limits.Can this process be considered in control?

A Cp value of 1.33 indicates a standard of how many standard deviations (sigmas)?

Acceptance sampling accepts or rejects an entire lot based on the information contained in the sample.

The ________ is a quality control chart that indicates when changes occur in the central tendency of a production process.

A Type II error occurs when:

Control charts for variables are based on data that come from:

Operations and Productivity

Operations Strategy in a Global Environment

Project Management

Forecasting

Design of Goods and Services

Managing Quality

Process Strategy

Capacity and Constraint Management

Location Strategies

Layout Strategies

Human Resources, job Design, and Work Measurement

Supply Chain Management

Inventory Management

Aggregate Planning and Sop

Material Requirements Planning Mrpand Erp

Short-Term Scheduling

Jit, tps, and Lean Operations

Maintenance and Reliability

Sustainability in the Supply Chain

Supply Chain Management Analytics

Decision-Making Tools

Linear Programming

Transportation Models

Waiting-Line Models

Learning Curves

Simulation

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