Question 1

When employing measurement data to study a process,the _______ monitors the process variation.

Accepted Answer

A)    
B) R chart 
C) p chart 
D) natural tolerance 
E) pattern analysis 
A)    
B) R chart 
C) p chart 
D) natural tolerance 
E) pattern analysis

Question 2

From 20 samples of size 100,total of 80 units is defective.What is the centerline for the p-chart?

Accepted Answer

A) .04 
B) .4 
C) .8 
D) .08 
A) .04 
B) .4 
C) .8 
D) .08

Question 3

The natural tolerance limits for a normally distributed process that is in statistical control:

Accepted Answer

A) Extend beyond the specification limits when a process is capable 
B) Are within the specification limits when a process is capable 
C) Contain approximately 99.73 percent of the individual process measurements 
D) Both B and C are correct 
E) Both A and C are correct 
A) Extend beyond the specification limits when a process is capable 
B) Are within the specification limits when a process is capable 
C) Contain approximately 99.73 percent of the individual process measurements 
D) Both B and C are correct 
E) Both A and C are correct

Question 4

If   = .0139 and 25 shipments of 20 items each were examined,what is the UCL and the LCL for the p-chart?

Accepted Answer

A) (.0118 .0159) 
B) (0 .0401) 
C) (.008 .0198) 
D) (0 .0924) 
A) (.0118 .0159) 
B) (0 .0401) 
C) (.008 .0198) 
D) (0 .0924)

Question 5

If a control chart is used correctly,and the necessary corrective actions are taken,as the control limits get _______,the potential quality of the product _____________.

Accepted Answer

A) Looser,increases 
B) Tighter,decreases 
C) Tighter,increases 
D) None of the above 
A) Looser,increases 
B) Tighter,decreases 
C) Tighter,increases 
D) None of the above

Question 6

A manufacturer of windows produces one type that has a plastic coating.The specification limits for the plastic coating are 30 and 70.From time to time the plastic coating can become uneven.Therefore,in order to keep the coating as even as possible,thickness measurements are periodically taken at four different locations on the window.15 subgroups were observed and each subgroup consists of the four thickness measurements taken across the windows at a particular time with the following results: mean of the means =   = 50.05 and the average range of 8.85. Is the process capable of meeting the specifications?

Accepted Answer

A) Yes 
B) No 
A) Yes 
B) No

Question 7

A foreman wants to use an   chart to control the average length of the bolts manufactured.He has recently collected the six samples given below.   Calculate the mean of the means   .

Accepted Answer

A) 2.010 
B) 2.406 
C) 2.000 
D) 2.005 
A) 2.010 
B) 2.406 
C) 2.000 
D) 2.005

Question 8

If a company is using an   chart for a given process with measurement data,it is generally not important or necessary to use an R or s chart.

Accepted Answer

A) True 
 B)False

Question 9

Auxiliary lines drawn on a control chart for accomplishing pattern analysis are called _____ boundaries.

Accepted Answer

A) sigma 
B) range 
C) zone 
D) mean 
A) sigma 
B) range 
C) zone 
D) mean

Question 10

A control chart on which subgroup means are plotted versus time is a(n)_____ chart.

Accepted Answer

A)    
B) R 
C) p 
D) C 
A)    
B) R 
C) p 
D) C

Question 11

Suppose that   and R charts are based on subgroups of size four are being used to monitor the tire diameter size of a new radial tire manufactured by a tire company.The   and R charts are found to be in statistical control with   inches.A histogram of the tire diameter measurements indicates that distribution of these measurements is approximately normally distributed. If the tire diameter specifications are 50 inches $\pm$ 1 inch,is the process capable of meeting the specifications?

Accepted Answer

A) Yes 
B) No 
A) Yes 
B) No

Question 12

If   and R charts are used to control a manufacturing process,______ chart is analyzed first and brought into a state of statistical control before preparing the _______ chart.

Accepted Answer

A) R, 
B)    
A) R, 
B)

Question 13

A _____ is a set of process observations that are examined for the purpose of constructing control charts.

Accepted Answer

A) Subgroup 
B) Sample 
C) Zone 
D) Common causes 
A) Subgroup 
B) Sample 
C) Zone 
D) Common causes

Question 14

A motorcycle manufacturer produces the parts for its vehicles in different locations and transports them to it plant for assembly.In order to keep the assembly operations running efficiently,it is vital that all parts be within specification limits.One important part used in the assembly is the engine camshaft and one important quality characteristic is the case hardness depth.Specifications state that the hardness depth must be between 3.0 mm and 6.0 mm.To investigate the process,the quality control engineer selected 25 daily subgroups of n = 5 and measured the hardness depth.The process yielded a mean of the means   = 4.50 and an average range = 1.01. Find the sigma level capability of the process.

Accepted Answer

A) 3.45 
B) 0.45 
C) 1.24 
D) 1.49 
A) 3.45 
B) 0.45 
C) 1.24 
D) 1.49

Question 15

A foreman wants to use an   chart to control the average length of the bolts manufactured.He has recently collected the six samples given below.   Calculate the average range.

Accepted Answer

A) .036 
B) .18 
C) .030 
D) .05 
A) .036 
B) .18 
C) .030 
D) .05

Question 16

A sequence of steadily increasing plot points on a control chart is referred to as a _____.

Accepted Answer

A) funneling 
B) run up 
C) cycle 
D) out of control 
A) funneling 
B) run up 
C) cycle 
D) out of control

Question 17

Reducing common causes of variation usually requires action by management.

Accepted Answer

A) True 
 B)False

Question 18

A powder metal manufacturing company is producing sleeves for a locking mechanism.The target (nominal)value for the inside diameter is 1 inch.The inside diameter specifications are 1 $\pm$ .005 inches.Assume that the process is in statistical control with   = 1.0002 inches,   = .003 inches and subgroup size of 5. What is the sigma level capability for this process?

Accepted Answer

A) 3.0 
B) 3.72 
C) 1.6 
D) 1.0 
E) 2.72 
A) 3.0 
B) 3.72 
C) 1.6 
D) 1.0 
E) 2.72

Question 19

In 20 samples there are a total of 80 units defective.If each sample consists of 100 units,find the appropriate UCL and the LCL for the p-chart.

Accepted Answer

A) (.0269 .0531) 
B) (.0204 .0596) 
C) (.0380 .0420) 
D) (0 .0988) 
A) (.0269 .0531) 
B) (.0204 .0596) 
C) (.0380 .0420) 
D) (0 .0988)

Question 20

A motorcycle manufacturer produces the parts for its vehicles in different locations and transports them to it plant for assembly.In order to keep the assembly operations running efficiently,it is vital that all parts be within specification limits.One important part used in the assembly is the engine camshaft and one important quality characteristic is the case hardness depth.Specifications state that the hardness depth must be between 3.0 mm and 6.0 mm.To investigate the process,the quality control engineer selected 25 daily subgroups of n = 5 and measured the hardness depth.The process yielded a mean of the means   = 4.50 and an average range = 1.01. Calculate the control limits for the X-bar chart.

Accepted Answer

A) (4.345 4.655) 
B) (3.49 5.51) 
C) (3.917 5.083) 
D) (2.365 6.635) 
A) (4.345 4.655) 
B) (3.49 5.51) 
C) (3.917 5.083) 
D) (2.365 6.635)

When employing measurement data to study a process,the _______ monitors the process variation.

From 20 samples of size 100,total of 80 units is defective.What is the centerline for the p-chart?

The natural tolerance limits for a normally distributed process that is in statistical control:

If = .0139 and 25 shipments of 20 items each were examined,what is the UCL and the LCL for the p-chart?

If a control chart is used correctly,and the necessary corrective actions are taken,as the control limits get _,the potential quality of the product _______.

A foreman wants to use an chart to control the average length of the bolts manufactured.He has recently collected the six samples given below. Calculate the mean of the means .

If a company is using an chart for a given process with measurement data,it is generally not important or necessary to use an R or s chart.

Auxiliary lines drawn on a control chart for accomplishing pattern analysis are called _____ boundaries.

A control chart on which subgroup means are plotted versus time is a(n)_____ chart.

If and R charts are used to control a manufacturing process, chart is analyzed first and brought into a state of statistical control before preparing the _ chart.

A _____ is a set of process observations that are examined for the purpose of constructing control charts.

A foreman wants to use an chart to control the average length of the bolts manufactured.He has recently collected the six samples given below. Calculate the average range.

A sequence of steadily increasing plot points on a control chart is referred to as a _____.

Reducing common causes of variation usually requires action by management.

In 20 samples there are a total of 80 units defective.If each sample consists of 100 units,find the appropriate UCL and the LCL for the p-chart.

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression

Model Building and Model Diagnostics

Time Series Forecasting

Nonparametric Methods

Decision Theory

Filters

Exam 17: Process Improvement Using Control Charts

When employing measurement data to study a process,the _______ monitors the process variation.

From 20 samples of size 100,total of 80 units is defective.What is the centerline for the p-chart?

The natural tolerance limits for a normally distributed process that is in statistical control:

If = .0139 and 25 shipments of 20 items each were examined,what is the UCL and the LCL for the p-chart?

If a control chart is used correctly,and the necessary corrective actions are taken,as the control limits get _______,the potential quality of the product _____________.

A foreman wants to use an chart to control the average length of the bolts manufactured.He has recently collected the six samples given below. Calculate the mean of the means .

If a company is using an chart for a given process with measurement data,it is generally not important or necessary to use an R or s chart.

Auxiliary lines drawn on a control chart for accomplishing pattern analysis are called _____ boundaries.

A control chart on which subgroup means are plotted versus time is a(n)_____ chart.

If and R charts are used to control a manufacturing process,______ chart is analyzed first and brought into a state of statistical control before preparing the _______ chart.

A _____ is a set of process observations that are examined for the purpose of constructing control charts.

A foreman wants to use an chart to control the average length of the bolts manufactured.He has recently collected the six samples given below. Calculate the average range.

A sequence of steadily increasing plot points on a control chart is referred to as a _____.

Reducing common causes of variation usually requires action by management.

In 20 samples there are a total of 80 units defective.If each sample consists of 100 units,find the appropriate UCL and the LCL for the p-chart.

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression

Model Building and Model Diagnostics

Time Series Forecasting

Nonparametric Methods

Decision Theory

Filters

If a control chart is used correctly,and the necessary corrective actions are taken,as the control limits get _,the potential quality of the product _______.

If and R charts are used to control a manufacturing process, chart is analyzed first and brought into a state of statistical control before preparing the _ chart.