Question 1

In 25 samples of 100 units each,75 units were found to be defective.Find the appropriate UCL and LCL for the p chart.

Accepted Answer

A) 0 to .0642 
B) 0 to .0828 
C) 0 to .0812 
D) .0129 to .0471 
E) 0 to .1324 
A) 0 to .0642 
B) 0 to .0828 
C) 0 to .0812 
D) .0129 to .0471 
E) 0 to .1324

Question 2

In a manufacturing process,if the limits for a control chart are set too _____________,the risk of unnecessarily tampering with the process ____________.

Accepted Answer

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

Question 3

If   = .0139 and 25 shipments of 20 items each were examined,what are 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 4

How well a process is able to meet the requirements set forth by the process design is called:

Accepted Answer

A) Process leeway. 
B) Quality of conformance. 
C) Quality of performance. 
D) Quality of design. 
A) Process leeway. 
B) Quality of conformance. 
C) Quality of performance. 
D) Quality of design.

Question 5

When using   and R charts to analyze and improve a process,first,the   chart is analyzed and the necessary action(s)to correct assignable causes of variation is (are)taken before the R chart is analyzed.

Accepted Answer

A) True 
 B)False

Question 6

Suppose that   and R charts based on subgroups of size 4 are being used to monitor the tire diameter of a new radial tire.The   andR charts are found to be in statistical control,with   inches.A histogram of the tire diameter measurements indicates that these measurements are approximately normally distributed.Compute the natural tolerance limits for this process.

Accepted Answer

A) [48.68,52.32] 
B) [49.89,51.11] 
C) [48.86,52.14] 
D) [46.75,54.25] 
A) [48.68,52.32] 
B) [49.89,51.11] 
C) [48.86,52.14] 
D) [46.75,54.25]

Question 7

An   chart is a control chart on which individual process measurements are plotted versus time.

Accepted Answer

A) True 
 B)False

Question 8

Use this information about 10 shipments of lightbulbs:   If 400 bulbs are selected at random from each of 10 shipments and the number of defectives in each shipment is given above,find the appropriate center line.

Accepted Answer

A) .005 
B) .05 
C) .0025 
D) .01 
A) .005 
B) .05 
C) .0025 
D) .01

Question 9

A p chart is a control chart on which the proportions of nonconforming units are plotted versus time.

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A) [2.345,8.955] 
B) [.076,1.924] 
C) [.415,1.585] 
D) [.429,10.871] 
A) [2.345,8.955] 
B) [.076,1.924] 
C) [.415,1.585] 
D) [.429,10.871]

Question 11

For a manufacturing process,   = 10 inches,   = .4 inches,and the subgroup sample size is 6 units.Calculate the standard control limits for the R chart.

Accepted Answer

A) 0 and .846 
B) 0 and .802 
C) 0 and .77 
D) 0 and 1.0 
E) -.09 and .89 
A) 0 and .846 
B) 0 and .802 
C) 0 and .77 
D) 0 and 1.0 
E) -.09 and .89

Question 12

A motorcycle manufacturer produces the parts for its vehicles in different locations and transports them to its plant for assembly.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 X-bar chart.

Accepted Answer

A) 1.01 
B) 4.50 
C) 3.49 
D) 0.90 
A) 1.01 
B) 4.50 
C) 3.49 
D) 0.90

Question 13

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.Assuming that the process is in statistical control,calculate the natural tolerance limits for the process.

Accepted Answer

A) [1.47,7.53] 
B) [3.197,5.803] 
C) [3.729,5.271] 
D) [4.066,4.934] 
A) [1.47,7.53] 
B) [3.197,5.803] 
C) [3.729,5.271] 
D) [4.066,4.934]

Question 14

The quality of an electronic component used in manufacturing cell phones is monitored with a p chart.In the last 20 days,daily samples of 75 units resulted in the following number of defective units per sample: 8,4,3,7,3,1,0,7,4,2,0,1,6,2,4,3,1,2,8,and 5.Find the appropriate center line.

Accepted Answer

A) .0473 
B) .2667 
C) .1067 
D) .0133 
A) .0473 
B) .2667 
C) .1067 
D) .0133

Question 15

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 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 16

Common causes of variation represent the inherent variability of a given process.

Accepted Answer

A) True 
 B)False

Question 17

How well a product or service performs in the marketplace is called:

Accepted Answer

A) Process capability. 
B) Quality of conformance. 
C) Quality of performance. 
D) Quality of design. 
E) Process control. 
A) Process capability. 
B) Quality of conformance. 
C) Quality of performance. 
D) Quality of design. 
E) Process control.

In 25 samples of 100 units each,75 units were found to be defective.Find the appropriate UCL and LCL for the p chart.

In a manufacturing process,if the limits for a control chart are set too _,the risk of unnecessarily tampering with the process .

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

How well a process is able to meet the requirements set forth by the process design is called:

When using and R charts to analyze and improve a process,first,the chart is analyzed and the necessary action(s)to correct assignable causes of variation is (are)taken before the R chart is analyzed.

An chart is a control chart on which individual process measurements are plotted versus time.

Use this information about 10 shipments of lightbulbs: If 400 bulbs are selected at random from each of 10 shipments and the number of defectives in each shipment is given above,find the appropriate center line.

A p chart is a control chart on which the proportions of nonconforming units are plotted versus time.

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

For a manufacturing process, = 10 inches, = .4 inches,and the subgroup sample size is 6 units.Calculate the standard control limits for the R chart.

The quality of an electronic component used in manufacturing cell phones is monitored with a p chart.In the last 20 days,daily samples of 75 units resulted in the following number of defective units per sample: 8,4,3,7,3,1,0,7,4,2,0,1,6,2,4,3,1,2,8,and 5.Find the appropriate center line.

Common causes of variation represent the inherent variability of a given process.

How well a product or service performs in the marketplace is called:

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

In 25 samples of 100 units each,75 units were found to be defective.Find the appropriate UCL and LCL for the p chart.

In a manufacturing process,if the limits for a control chart are set too _____________,the risk of unnecessarily tampering with the process ____________.

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

How well a process is able to meet the requirements set forth by the process design is called:

When using and R charts to analyze and improve a process,first,the chart is analyzed and the necessary action(s)to correct assignable causes of variation is (are)taken before the R chart is analyzed.

An chart is a control chart on which individual process measurements are plotted versus time.

Use this information about 10 shipments of lightbulbs: If 400 bulbs are selected at random from each of 10 shipments and the number of defectives in each shipment is given above,find the appropriate center line.

A p chart is a control chart on which the proportions of nonconforming units are plotted versus time.

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

For a manufacturing process, = 10 inches, = .4 inches,and the subgroup sample size is 6 units.Calculate the standard control limits for the R chart.

The quality of an electronic component used in manufacturing cell phones is monitored with a p chart.In the last 20 days,daily samples of 75 units resulted in the following number of defective units per sample: 8,4,3,7,3,1,0,7,4,2,0,1,6,2,4,3,1,2,8,and 5.Find the appropriate center line.

Common causes of variation represent the inherent variability of a given process.

How well a product or service performs in the marketplace is called:

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 unnecessarily tampering with the process .