Question 1

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 2

If   = 5.2,   = .3,and n = 4,and if the specifications are [4.6,5.8],is the process capable?

Accepted Answer

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

Question 3

In 20 samples,there are 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 4

A control chart on which subgroup ranges 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 5

In a manufacturing process,if the limits for a control chart are set too _____________,the risk of not investigating a special cause of variation and possibly not taking a corrective action ____________.

Accepted Answer

A) Tight,increases 
B) Loose,increases 
C) Loose,decreases 
D) None of these 
A) Tight,increases 
B) Loose,increases 
C) Loose,decreases 
D) None of these

Question 6

If 20 samples of size 7 are drawn,with   = 33.33 and   = 5.65,what is the A-B upper boundary for the   chart?

Accepted Answer

A) 35.697 
B) 34.908 
C) 34.347 
D) 34.008 
A) 35.697 
B) 34.908 
C) 34.347 
D) 34.008

Question 7

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 ± .005 inches.Assume that the process is in statistical control with   = 1.0002 inches,   = .003 inches,and subgroup size of 5.Calculate the estimated proportion of out-of-specification sleeve inside diameters.

Accepted Answer

A) .0471 
B) .0217 
C) .0001 
D) .4783 
E) .0139 
A) .0471 
B) .0217 
C) .0001 
D) .4783 
E) .0139

Question 8

A motorcycle manufacturer produces the parts for its vehicles in different locations and transports them to its 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 center line for the R chart.

Accepted Answer

A) 1.01 
B) 0.22 
C) 4.50 
D) 0.90 
A) 1.01 
B) 0.22 
C) 4.50 
D) 0.90

Question 9

Assume that 25 samples of 50 each are taken and the total number of defectives is 34.Calculate

Accepted Answer

A) .680 
B) .453 
C) .816 
D) .0272 
A) .680 
B) .453 
C) .816 
D) .0272

Question 10

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 11

If 20 samples of size 7 are drawn,with   = 33.33 and   = 5.65,what are the LCL and the UCL for the   chart?

Accepted Answer

A) [32.313,34.347] 
B) [30.963,35.697] 
C) [27.68,38,98] 
D) [32.911,33.749] 
A) [32.313,34.347] 
B) [30.963,35.697] 
C) [27.68,38,98] 
D) [32.911,33.749]

Question 12

If   and R charts are used to control a manufacturing process,an ______ 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 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,to keep the coating as even as possible,thickness measurements are periodically taken at four different locations on the window.15 subgroups were observed,each consisting of four thickness measurements,with the following results: mean of the means =   = 50.05,and average range of 8.85.Find the sigma level capability of the process.

Accepted Answer

A) 4.64 
B) -4.66 
C) 7.83 
D) 2.25 
A) 4.64 
B) -4.66 
C) 7.83 
D) 2.25

Question 14

Unusual sources of process variation that can be attributed to specific reasons are called ____________ causes of variation.

Accepted Answer

A) common 
B) assignable 
C) usual 
D) expected 
A) common 
B) assignable 
C) usual 
D) expected

Question 15

Reducing common causes of variation usually requires action by management.

Accepted Answer

A) True 
 B)False

Question 16

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 ± .005 inches.Assume that the process is in statistical control with   = 1.0002 inches,   = .003 inches,and subgroup size of 5.What are the natural tolerance limits for this process? Is the process capable?

Accepted Answer

A) .99847 to 1.00193,yes 
B) .99847 to 1.00193,no 
C) .99633 to 1.004,yes 
D) .99633 to 1.004,no 
E) .995 to 1.005,yes 
A) .99847 to 1.00193,yes 
B) .99847 to 1.00193,no 
C) .99633 to 1.004,yes 
D) .99633 to 1.004,no 
E) .995 to 1.005,yes

Question 17

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 chart or s chart.

Accepted Answer

A) True 
 B)False

Question 18

Periodic sampling is observing the output of a process at random intervals.

Accepted Answer

A) True 
 B)False

Question 19

Process leeway is the distance between natural tolerance limits and control limits.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A) decreases 
B) increases 
C) stays the same 
D) fluctuates 
A) decreases 
B) increases 
C) stays the same 
D) fluctuates

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

If = 5.2, = .3,and n = 4,and if the specifications are [4.6,5.8],is the process capable?

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

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

In a manufacturing process,if the limits for a control chart are set too _,the risk of not investigating a special cause of variation and possibly not taking a corrective action .

If 20 samples of size 7 are drawn,with = 33.33 and = 5.65,what is the A-B upper boundary for the chart?

Assume that 25 samples of 50 each are taken and the total number of defectives is 34.Calculate

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.

If 20 samples of size 7 are drawn,with = 33.33 and = 5.65,what are the LCL and the UCL for the chart?

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

Unusual sources of process variation that can be attributed to specific reasons are called ____________ causes of variation.

Reducing common causes of variation usually requires action by management.

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 chart or s chart.

Periodic sampling is observing the output of a process at random intervals.

Process leeway is the distance between natural tolerance limits and control limits.

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

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 and Model Building

Filters

Exam 15: Process Improvement Using Control Charts

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

If = 5.2, = .3,and n = 4,and if the specifications are [4.6,5.8],is the process capable?

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

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

In a manufacturing process,if the limits for a control chart are set too _____________,the risk of not investigating a special cause of variation and possibly not taking a corrective action ____________.

If 20 samples of size 7 are drawn,with = 33.33 and = 5.65,what is the A-B upper boundary for the chart?

Assume that 25 samples of 50 each are taken and the total number of defectives is 34.Calculate

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.

If 20 samples of size 7 are drawn,with = 33.33 and = 5.65,what are the LCL and the UCL for the chart?

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

Unusual sources of process variation that can be attributed to specific reasons are called ____________ causes of variation.

Reducing common causes of variation usually requires action by management.

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 chart or s chart.

Periodic sampling is observing the output of a process at random intervals.

Process leeway is the distance between natural tolerance limits and control limits.

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

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 and Model Building

Filters

In a manufacturing process,if the limits for a control chart are set too _,the risk of not investigating a special cause of variation and possibly not taking a corrective action .

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