Question 1

Statistical process control is a tool primarily for

Accepted Answer

A) identifying process variability due to natural occurrences 
B) accepting or rejecting products 
C) identifying process variability due to nonrandom causes 
D) training workers for a production process 
A) identifying process variability due to natural occurrences 
B) accepting or rejecting products 
C) identifying process variability due to nonrandom causes 
D) training workers for a production process C

Question 2

If the process capability index,Cpk.is greater than 1.00,then

Accepted Answer

A) the process is not capable of meeting design specifications 
B) the process is capable of meeting design specification 
C) the process corresponds to six sigma quality 
D) the process will generate defects 
A) the process is not capable of meeting design specifications 
B) the process is capable of meeting design specification 
C) the process corresponds to six sigma quality 
D) the process will generate defects B

Question 3

One of the general guidelines for identifying a pattern in a control chart is

Accepted Answer

A) 14 points on one side of the center line 
B) 4 out of 5 consecutive points in zone A on one side of the center line 
C) 8 consecutive points on one side of the center line 
D) 8 consecutive points alternating up or down 
A) 14 points on one side of the center line 
B) 4 out of 5 consecutive points in zone A on one side of the center line 
C) 8 consecutive points on one side of the center line 
D) 8 consecutive points alternating up or down C

Question 4

In an Excel spreadsheet for a c-chart,if the population process average for 20 samples,c,is in cell H4,the Excel formula for the upper control limit is

Accepted Answer

A) =H4+3*SQRTH4*1-H4))/100)) 
B) =H4+3*SQRTH4/20) 
C) =H4+3*SQRTH4) 
D) =H4+SQRT3*H4) 
A) =H4+3*SQRTH4*1-H4))/100)) 
B) =H4+3*SQRTH4/20) 
C) =H4+3*SQRTH4) 
D) =H4+SQRT3*H4)

Question 5

For a process control chart a process is generally considered to be in control if

Accepted Answer

A) most points are near the center line 
B) approximately an equal number of sample points are above and below the center line 
C) there is no discernible pattern to the sample points 
D) all of the above 
A) most points are near the center line 
B) approximately an equal number of sample points are above and below the center line 
C) there is no discernible pattern to the sample points 
D) all of the above

Question 6

In an Excel spreadsheet for a p-chart,if the total number of defectives for 20 samples of 100 observations each is in cell F26,the Excel formula for p is

Accepted Answer

A) =F26)/20)*100)) 
B) =F26)/20) 
C) =F26)*100))/20 
D) =F26)*20))/100 
A) =F26)/20)*100)) 
B) =F26)/20) 
C) =F26)*100))/20 
D) =F26)*20))/100

Question 7

Product design specifications that are twice as large as the natural variations for 3-sigma control chart limits reflects

Accepted Answer

A) Pareto level quality 
B) ISO 9000 certification 
C) Baldrige Award criteria 
D) Six Sigma 
A) Pareto level quality 
B) ISO 9000 certification 
C) Baldrige Award criteria 
D) Six Sigma

Question 8

In a process where a large number of defects are likely to occur

Accepted Answer

A) Cp p = 1.0 
C) Cp > 1.0 
D) Cp = Cpk 
A) Cp p = 1.0 
C) Cp > 1.0 
D) Cp = Cpk

Question 9

The design specifications that reflect customer requirements for a product are

Accepted Answer

A) control limits 
B) process capabilities 
C) attributes 
D) tolerances 
A) control limits 
B) process capabilities 
C) attributes 
D) tolerances

Question 10

In order to determine if the time required for students to take a final exam is excessive,five students were selected at random from each of six classes.If the process average is 123.77 minutes and the average range is 66.83 minutes,the upper and lower control limits of a 3-sigma x-chart are

Accepted Answer

A) UCL = 187.35,LCL = 109.95 
B) UCL = 157.80,LCL = 89.80 
C) UCL = 176.66,LCL = 120.33 
D) UCL = 162,53,LCL = 89.01 
A) UCL = 187.35,LCL = 109.95 
B) UCL = 157.80,LCL = 89.80 
C) UCL = 176.66,LCL = 120.33 
D) UCL = 162,53,LCL = 89.01

Question 11

In order to determine if the time required for students to take a final exam is excessive,five students were selected at random from each of six classes.If the process average is 123.77 minutes and the average range is 66.83 minutes,the upper and lower control limits of a 3-sigma R-chart are

Accepted Answer

A) UCL = 141,LCL = 0 
B) UCL = 133.6,LCL = 0 
C) UCL = 96,LCL = 0 
D) UCL = 152.3,LCL = 0 
A) UCL = 141,LCL = 0 
B) UCL = 133.6,LCL = 0 
C) UCL = 96,LCL = 0 
D) UCL = 152.3,LCL = 0

Question 12

Wider control limits on a process control chart i.e. ,3 sigma as opposed to 2 sigma limits)makes the chart

Accepted Answer

A) more sensitive to changes in the process 
B) correspond to an overall normal probability of 95% 
C) have a higher probability that the sample values will fall outside the control limits 
D) harder to show changes in the process that are not random 
A) more sensitive to changes in the process 
B) correspond to an overall normal probability of 95% 
C) have a higher probability that the sample values will fall outside the control limits 
D) harder to show changes in the process that are not random

Question 13

Control charts are typically used

Accepted Answer

A) at every step in a production or service process 
B) at the beginning and end of a production or service process 
C) at critical points where it is particularly costly if the process goes out of control 
D) at labor intensive points in the process 
A) at every step in a production or service process 
B) at the beginning and end of a production or service process 
C) at critical points where it is particularly costly if the process goes out of control 
D) at labor intensive points in the process

Question 14

In a "zone" pattern test each zone is how many standard deviations wide?

Accepted Answer

A) 1 
B) 1/3 
C) 2 
D) A2R 
A) 1 
B) 1/3 
C) 2 
D) A2R

Question 15

An attribute control chart that uses the actual number of defects per item in a sample is a

Accepted Answer

A) p-chart 
B) mean chart 
C) range chart 
D) c-chart 
A) p-chart 
B) mean chart 
C) range chart 
D) c-chart

Question 16

If 20 samples of a production process are taken and there are 240 total defects,the upper and lower control limits for a 3-sigma c-chart are

Accepted Answer

A) UCL = 16.472,LCL = 7.528 
B) UCL = 15.464,LCL = 8.536 
C) UCL = 22.392,LCL = 1.608 
D) UCL = 18.728,LCL = 5.272 
A) UCL = 16.472,LCL = 7.528 
B) UCL = 15.464,LCL = 8.536 
C) UCL = 22.392,LCL = 1.608 
D) UCL = 18.728,LCL = 5.272

Question 17

If samples of 100 for a process are taken and p is 0.15,the upper and lower control limits for a 3-sigma p-chart are

Accepted Answer

A) UCL = 0.190 ,LCL = 0.010 
B) UCL = 0.257,LCL = 0.043 
C) UCL = 0.322,LCL = 0.000 
D) UCL = 0.045,LCL = 0.005 
A) UCL = 0.190 ,LCL = 0.010 
B) UCL = 0.257,LCL = 0.043 
C) UCL = 0.322,LCL = 0.000 
D) UCL = 0.045,LCL = 0.005

Question 18

In general,sample sizes for attribute control charts are

Accepted Answer

A) smaller than for variable control charts 
B) larger than for variable control charts 
C) the same as for variable control charts 
D) larger or smaller than variable control charts 
A) smaller than for variable control charts 
B) larger than for variable control charts 
C) the same as for variable control charts 
D) larger or smaller than variable control charts

Question 19

A p-chart and R-chart are control charts for

Accepted Answer

A) variables 
B) attributes 
C) attributes for a p-chart and variables for a R-chart 
D) attributes for a R-chart and variables for a p-chart 
A) variables 
B) attributes 
C) attributes for a p-chart and variables for a R-chart 
D) attributes for a R-chart and variables for a p-chart

Question 20

An example of a product or service quality attribute is

Accepted Answer

A) the weight of a bag of potato chips 
B) the time it takes to serve a customer at a store 
C) the completeness of an online retail order 
D) the temperature of a cup of coffee at a barista 
A) the weight of a bag of potato chips 
B) the time it takes to serve a customer at a store 
C) the completeness of an online retail order 
D) the temperature of a cup of coffee at a barista

Exam 4: Statistical Process Control

Statistical process control is a tool primarily for

If the process capability index,Cpk.is greater than 1.00,then

One of the general guidelines for identifying a pattern in a control chart is

In an Excel spreadsheet for a c-chart,if the population process average for 20 samples,c,is in cell H4,the Excel formula for the upper control limit is

For a process control chart a process is generally considered to be in control if

In an Excel spreadsheet for a p-chart,if the total number of defectives for 20 samples of 100 observations each is in cell F26,the Excel formula for p is

Product design specifications that are twice as large as the natural variations for 3-sigma control chart limits reflects

In a process where a large number of defects are likely to occur

The design specifications that reflect customer requirements for a product are

In order to determine if the time required for students to take a final exam is excessive,five students were selected at random from each of six classes.If the process average is 123.77 minutes and the average range is 66.83 minutes,the upper and lower control limits of a 3-sigma x-chart are

In order to determine if the time required for students to take a final exam is excessive,five students were selected at random from each of six classes.If the process average is 123.77 minutes and the average range is 66.83 minutes,the upper and lower control limits of a 3-sigma R-chart are

Wider control limits on a process control chart i.e. ,3 sigma as opposed to 2 sigma limits)makes the chart

Control charts are typically used

In a "zone" pattern test each zone is how many standard deviations wide?

An attribute control chart that uses the actual number of defects per item in a sample is a

If 20 samples of a production process are taken and there are 240 total defects,the upper and lower control limits for a 3-sigma c-chart are

If samples of 100 for a process are taken and p is 0.15,the upper and lower control limits for a 3-sigma p-chart are

In general,sample sizes for attribute control charts are

A p-chart and R-chart are control charts for

An example of a product or service quality attribute is

Introduction to Operations and Supply Chain Management

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If the process capability index,C_pk_.is greater than 1.00_,then