Question 1

Plots of sample ranges indicate that the most recent value is below the lower control limit.What course of action would you recommend?

Accepted Answer

A) Since there is no obvious pattern in the measurements,variability is in control. 
B) One value outside the control limits is insufficient to warrant any action. 
C) Lower than expected dispersion is a desirable condition;there is no reason to investigate. 
D) The process is out of control;reject the last units produced. 
E) Variation is not in control;investigate what created this condition. 
A) Since there is no obvious pattern in the measurements,variability is in control. 
B) One value outside the control limits is insufficient to warrant any action. 
C) Lower than expected dispersion is a desirable condition;there is no reason to investigate. 
D) The process is out of control;reject the last units produced. 
E) Variation is not in control;investigate what created this condition.

Question 2

A process range chart illustrates the amount of dispersion within the samples.

Accepted Answer

A) True 
 B)False

Question 3

A quality analyst wants to construct a sample mean chart for controlling a packaging process.He knows from past experience that the process standard deviation is two ounces.Each day last week,he randomly selected four packages and weighed each.The data from that activity appear below.
   (a)Calculate all sample means and the mean of all sample means.
(b)Calculate upper and lower 2-sigma x-bar chart control limits that allow for natural variations.
(c)Based on the x-bar chart,is this process in control?

Accepted Answer

(a)The five sample means are 23,21,20,19

Question 4

What is the difference between natural and assignable causes of variation?

Accepted Answer

Natural variations are those variations

Plots of sample ranges indicate that the most recent value is below the lower control limit.What course of action would you recommend?

A process range chart illustrates the amount of dispersion within the samples.

What is the difference between natural and assignable causes of variation?

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

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Exam 19: Statistical Process Control

Plots of sample ranges indicate that the most recent value is below the lower control limit.What course of action would you recommend?

A process range chart illustrates the amount of dispersion within the samples.

What is the difference between natural and assignable causes of variation?

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