Deck 16: Time Series Forecasting and Index Numbers

Question 1

Sigma level capability is the number of estimated process standard deviations between the estimated process mean and the specification limit closest to the estimated process mean.

Answer 1

True

Question 2

If a manufacturing process is in statistical control,it means that the process is capable of producing products that meet the needs of the customers.

Answer 2

False

Question 3

When using
and R charts to analyze and improve a process,first,the 11ec8fed_982f_245d_bdf7_67e431980607_TB2569_11
chart is analyzed and the necessary action(s)to correct assignable causes of variation is (are)taken before the R chart is analyzed.

Answer 3

False

Question 4

How well the design of the product meets and exceeds the needs and expectations of the customers is called the quality of performance.

Question 5

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

Question 6

If a process is only influenced by common causes of variation,we can state that the process is in statistical control.

Question 7

Reducing common causes of variation usually requires action by management.

Question 8

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

Question 9

A goal of statistical process control is continuous process improvement.

Question 10

Unusual sources of variation that can be attributed to specific causes are called the common causes of process variation.

Question 11

If a process is stable and in statistical control,it is not influenced by assignable causes of variation.

Question 12

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

Question 13

For a given control chart,zone boundaries consist of the UCL and LCL.

Question 14

A sequence of steadily decreasing points on a control chart is called run down.

Question 15

A control chart is a graph whose purpose is to detect assignable causes of variation in a process.

Question 16

Control charts are used to reduce common causes of variation.

Question 17

A cause-and-effect diagram enumerates the potential causes of an undesirable effect on the process to discover sources of process variation and to identify opportunities for process improvement.

Question 18

How well a process is able to meet the requirements set forth by the process design is called the quality of design.

Question 19

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

Question 20

A range chart is a control chart on which ranges between individual process measurements within a subgroup are plotted.

Question 21

Observing the output of a process at fixed time intervals is referred to as ___________ sampling.

A) consecutive
B) random
C) fixed
D) periodic

Question 22

When a process is influenced only by common causes of variation,

A) the process may also be influenced by assignable causes of variation.
B) many plot points on a control chart will be outside the control limits.
C) the process is always capable of meeting customer requirements.
D) the process is in statistical control.
E) the process is never capable of meeting customer requirements.

Question 23

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

A) tight,increases
B) loose,increases
C) tight,decreases
D) None of the other choices is correct.

Question 24

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

A) process leeway.
B) quality of conformance.
C) quality of performance.
D) quality of design.

Question 25

When employing measurement data to study a process,the ____________ monitors the process mean.

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

Question 26

Which of the following control charts is designed to control the proportion of nonconforming units?

A) p chart
B)
Chart
C) R chart

Question 27

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.

Question 28

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

A) process capability.
B) quality of conformance.
C) quality of performance.
D) quality of design.
E) process control.

Question 29

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) looser,increases
B) tighter,decreases
C) tighter,increases
D) None of the other choices is correct.

Question 30

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

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

Question 31

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

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) are within the specification limits when a process is capable and contain approximately 99.73 percent of the individual process measurements.
E) extend beyond the specification limits when a process is capable and contain approximately 99.73 percent of the individual process measurements.

Question 32

How well the design of a product or service meets and exceeds the needs and expectations of the customer is called

A) process capability.
B) quality of conformance.
C) quality of performance.
D) quality of design.
E) process control.

Question 33

Common causes of process variation

A) are sources of unusual process variation.
B) usually must be remedied by management.
C) usually must be remedied by local supervision.
D) always exist together with assignable causes of variation.
E) can never be remedied or reduced.

Question 34

Rational subgrouping allows us to detect changes ____________ subgroups.

A) within
B) between
C) in the sizes of
D) None of the other choices is correct.

Question 35

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

Question 36

If the ________ limits are within the ________ limits,then it can be concluded that the process is __________.

A) specification,natural,capable
B) natural,specification,stable
C) specification,natural,stable
D) natural,specification,capable

Question 37

A(n)_______ chart monitors the number of nonconforming units in a subgroup.

A)
B) R
C) C
D) p

Question 38

If the process variability steadily increases,we would observe

A) an alternating pattern of a high value followed by a low value on the R chart.
B) an upward trend on the R chart.
C) a downward trend on the R chart.
D) an increasing gradual funnel pattern on the R chart.
E) a decreasing gradual funnel pattern on the R chart.

Question 39

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

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

Question 40

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 ____________.

A) tight,increases
B) loose,increases
C) loose,decreases
D) None of the other choices is correct.

Question 41

___________ causes of variation may be remedied by local supervision.

A) Common
B) Assignable
C) Usual
D) Expected

Question 42

A systematic method for analyzing process data in which we monitor process variation is called ______________.

A) control charting
B) sigma level capability
C) statistical process control
D) rational subgrouping

Question 43

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

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

Question 44

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

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

Question 45

The distance between natural tolerance limits and customer specifications is called ____________.

A) process leeway
B) sigma level
C) control limits
D) a zone

Question 46

How well a process is able to meet the requirements set forth by the process design is called the quality of _____________.

A) performance
B) conformance
C) design
D) control

Question 47

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

A)
B) R
C) p
D) C

Question 48

_________ is the set of international standards on quality management and quality assurance systems.It establishes processes for assuring that goods and services offered by the company meet a consistent level of quality acceptable to customers.

A) Control Charting
B) SQC
C) ISO 9000
D) ASQC

Question 49

How well a product or a service performs in the marketplace is called the quality of ______________.

A) performance
B) conformance
C) design
D) control

Question 50

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

A)
B) R
C) p
D) C

Question 51

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.

A) R,
B)11ec8e32_5b7b_77d6_9731_5f6defa3e268_TB2569_11, R

Question 52

Sources of process variations that are inherent to the process design are called ___________ causes of variation.

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

Question 53

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

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

Question 54

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

A) subgroup
B) sample
C) zone
D) list of common causes

Question 55

A control chart on which the proportions of nonconforming units in subgroups of size n are plotted versus time is a(n)_____ chart.

A)
B) R
C) p
D) C

Question 56

A unit that fails to meet specifications is called a _____________ unit.

A) conforming
B) capable
C) defective
D) common cause

Question 57

The number of estimated process standard deviations between and the closest specification limit is the _____________ of the process.

A) sigma level capability
B) leeway
C) mean
D) capability

Question 58

A(n)____________ process has the ability to produce products or services that meet customer requirements.

A) in-control
B) assignable
C) capable
D) statistical

Question 59

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 _____________.

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

Question 60

If = 5.2,
= )3,and n = 4,calculate the natural tolerance limits.

A) [5.054,5.346]
B) [4.3,6.1]
C) [4.806,5.594]
D) [4.763,5.637]

Question 61

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

A) [.0118,.0159]
B) [0,.0401]
C) [.008,.0198]
D) [0,.0924]

Question 62

If = 16.1,
= .03,and n = 6,calculate the natural tolerance limits.

A) [16.065,16.135]
B) [16.088,16.112]
C) [15.745,16.455]
D) [16.055,16.145]

Question 63

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

A) Yes
B) No

Question 64

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

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

Question 65

If = 2.0144,
= .0972,and there are 25 subgroups of size 5,find the UCL and the LCL for the R chart.

A) [.045,.1498]
B) [.0972,.2055]
C) [0,.2055]
D) [0.2,114]

Question 66

Use this information about 10 shipments of lightbulbs.Shipment
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) .005
B) .05
C) .0025
D) .01

Question 67

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) [.0269,.0531]
B) [.0204,.0596]
C) [.0380,.0420]
D) [0,.0988]

Question 68

Assume that 25 samples of 50 each are taken and the total number of defectives is 34.Find the LCL and UCL for the p chart.

A) [.0134,.0410]
B) [0,.0962]
C) [.0042,.0502]
D) [.0239,.0304]

Question 69

If = 2.0144,
= .0972,and there are 25 subgroups of size 5,find the UCL and the LCL for the Chart.

A) [1.999,2.029]
B) [1.958,2.071]
C) [1.917,2.112]
D) [1.437,2.591]

Question 70

If = 16.1,
= .03,and n = 6,and if the specifications are [15.9,16.3],is the process capable?

A) Yes
B) No

Question 71

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

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