Question 1

The acceptable quality level (AQL)is the average level of quality we are willing to accept.

Accepted Answer

A) True 
 B)False  False

Question 2

An acceptance sampling plan must define "good lots" and "bad lots" and specify the risk level associated with each one.

Accepted Answer

A) True 
 B)False  True

Question 3

Assignable variation:

Accepted Answer

A) is a sign that a process is under control. 
B) is to be identified and investigated. 
C) is the same as random variation. 
D) is variation that cannot be traced to a specific cause. 
E) leads to a steep OC curve. 
A) is a sign that a process is under control. 
B) is to be identified and investigated. 
C) is the same as random variation. 
D) is variation that cannot be traced to a specific cause. 
E) leads to a steep OC curve. B

Question 4

The specification for a plastic liner for concrete highway projects calls for a thickness of 6.0 mm ± 0.1 mm.The standard deviation of the process is estimated to be 0.02 mm.What are the upper and lower specification limits for this product? The process is known to operate at a mean thickness of 6.03 mm.What is the Cp and Cpk for this process? About what percent of all units of this liner will meet specifications?

Accepted Answer

LSL = 5.9 mm,USL = 6.1 mm.Cp is (6.1 - 5

Question 5

Acceptance sampling's primary purpose is to:

Accepted Answer

A) estimate process quality. 
B) identify processes that are out of control. 
C) detect and eliminate defectives. 
D) decide if a lot meets predetermined standards. 
E) determine whether defective items found in sampling should be replaced. 
A) estimate process quality. 
B) identify processes that are out of control. 
C) detect and eliminate defectives. 
D) decide if a lot meets predetermined standards. 
E) determine whether defective items found in sampling should be replaced.

Question 6

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 7

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 8

A hospital-billing auditor has been inspecting patient bills.While almost all bills contain some errors,the auditor is looking now for large errors (errors in excess of $250).Each day last week,the auditor examined 100 bills and found an average defect rate of 16%.Calculate the upper and lower limits for the billing process for 99.73% confidence.

Accepted Answer

0.16 plus or minus (

Question 9

Up to three standard deviations above or below the centerline is the amount of variation that statistical process control allows for:

Accepted Answer

A) Type I errors. 
B) about 95.5% variation. 
C) natural variation. 
D) all types of variation. 
E) assignable variation. 
A) Type I errors. 
B) about 95.5% variation. 
C) natural variation. 
D) all types of variation. 
E) assignable variation.

Question 10

The defect rate for a product has historically been about 1.6%.What are the upper and lower control chart limits for a p-chart,if you wish to use a sample size of 100 and 3-sigma limits?

Accepted Answer

UCLp = @#IMG-DLM& + 3 @#IMG-DLM& = 0.016

Question 11

A bank's manager has videotaped 20 different teller transactions to observe the number of mistakes being made.Ten transactions had no mistakes,five had one mistake and five had two mistakes.Compute proper control limits at the 90% confidence level.

Accepted Answer

A c-chart should be used,and f

Question 12

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 13

Some degree of variability is present in almost all processes.

Accepted Answer

A) True 
 B)False

Question 14

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 15

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 16

The Central Limit Theorem states that when the sample size increases,the distribution of the sample means will approach the normal distribution.

Accepted Answer

A) True 
 B)False

Question 17

The ________ is the lowest level of quality that we are willing to accept.

Accepted Answer

AQL or acc

Question 18

The number of late insurance claim payouts per 100 should be measured with what type of control chart?

Accepted Answer

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

Question 19

A woodworker is concerned about the quality of the finished appearance of her work.In sampling units of a split-willow hand-woven basket,she has found the following number of finish defects in ten units sampled: 4,0,3,1,2,0,1,2,0,2.
a.Calculate the average number of defects per basket.
b.If 3-sigma control limits are used,calculate the lower control limit and upper control limit.

Accepted Answer

(a)1.5; (b

Question 20

If a process has only natural variations,________ percent of the time the sample averages will fall inside the ±3-sigma control limits.

Accepted Answer

The answer of If a process has only natural variations,________...

Exam 19: Statistical Process Control

The acceptable quality level (AQL)is the average level of quality we are willing to accept.

An acceptance sampling plan must define "good lots" and "bad lots" and specify the risk level associated with each one.

Assignable variation:

Acceptance sampling's primary purpose is to:

A run test is used:

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.

Up to three standard deviations above or below the centerline is the amount of variation that statistical process control allows for:

The defect rate for a product has historically been about 1.6%.What are the upper and lower control chart limits for a p-chart,if you wish to use a sample size of 100 and 3-sigma limits?

A bank's manager has videotaped 20 different teller transactions to observe the number of mistakes being made.Ten transactions had no mistakes,five had one mistake and five had two mistakes.Compute proper control limits at the 90% confidence level.

A Type I error occurs when:

Some degree of variability is present in almost all processes.

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?

The normal application of a p-chart is in:

The Central Limit Theorem states that when the sample size increases,the distribution of the sample means will approach the normal distribution.

The ________ is the lowest level of quality that we are willing to accept.

The number of late insurance claim payouts per 100 should be measured with what type of control chart?

If a process has only natural variations,________ percent of the time the sample averages will fall inside the ±3-sigma control limits.

Operations and Productivity

Operations Strategy in a Global Environment

Project Management

Forecasting

Design of Goods and Services

Managing Quality

Process Strategy

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

Lean Operations

Maintenance and Reliability

Sustainability in the Supply Chain

Capacity and Constraint Management

Supply Chain Management Analytics

Decision-Making Tools

Linear Programming

Transportation Models

Waiting-Line Models

Learning Curves

Simulation

Filters