Chapter 10

1.

1 point

In order for a process to be deemed capable, it must have a capability ratio of at least 1.33

True

False

2.

1 point

If a process is not centered within its specification interval, use of the basic capability index, Cp, will lead to an assessment of capability that is:

inflated

too small

invariant

unbiased

3.

1 point

Inspection is an appraisal activity that compares process output to a standard.

True

False

4.

1 point

Suppose a process, when in control, has an average of 9 defects per unit. The lower and upper limits for the three-sigma control charts that would be used to monitor it would be, respectively

0 and 18

6 and 24

4.5 and 13.5

3 and 12

5.

1 point

Narrowing control limits from 3s to 2s will increase the probability of making a(n) error

beta

Type III

Type I

Type II

alpha

6.

1 point

We are monitoring a process that has an outcome that falls into one of two categories. We would use ________________ to evaluate whether this process is remaining in control.

x-bar

P-charts

R-charts

z-charts

7.

1 point

Attributes are characteristics that can be counted

True

False

8.

1 point

A process that is generating output that varies randomly would be judged in control

True

False

9.

1 point

The larger the sample size, the narrower the sampling distribution

True

False

10.

1 point

We are monitoring a process that has an outcome that is normally distributed with a mean of 100 and a standard deviation of 10. We would use __________ to evaluate whether this process's variability is remaining in control.

x-bar

P-charts

R-charts

z-charts

11.

1 point

When 20 or more samples are taken, the results are combined to obtain a sampling distribution.

True

False

12.

1 point

The ratio of a centered process's specifications width to its process width is called the:

index chart

capability index

control ratio

specification metric

13.

1 point

Which type of control chart would be appropriate if the variable being monitored is the number of students absent from section 1 of a statistics class?

x-bar

c

R

p

14.

1 point

The mean of a sampling distribution of means is equal to the mean of the process distribution.

True

False

15.

1 point

How many A/B median runs are there in the following data: 3,5,4,8,7,6,4,3,2,9

3

6

4

5

2

16.

1 point

Nonrandom process variations can be reduced through statistical quality control.

True

False

17.

1 point

The ________________ the sample size, the ________________ the sampling distribution.

smaller; more accurate

larger; less variable

larger; more accurate

smaller; less variable

18.

1 point

Variations in the characteristics (eg weight) of process output provide the rationale for process control.

True

False

19.

1 point

Convenience is a dimension of product quality

True

False

20.

1 point

Process control strives to weed out defective product before it is shipped to customers

True

False

21.

1 point

Suppose that the grand process mean for a measured variable is 83. The upper control limit in the three-sigma control chart for this process's mean is 92. What would the lower control limit in the two-sigma control chat for this processes's mean be?

72

79

77

71

22.

1 point

Approximately half of the values on a control chart should be above the center line.

True

False

23.

1 point

Statistical process (SPC) control involves acceptance sampling

True

False

24.

1 point

We are monitoring a process that has an outcome that is normally distributed with a mean of 100 and a standard deviation of 10. We would use __________ to evaluate whether this process's average is remaining in control.

P-charts

z-charts

x-bar

R-charts

25.

1 point

In statistical process control, attributes are characteristics that can be:

observed

replicated

measured

counted

26.

1 point

How many up/down runs are there in the following data: 5,2,3,5,4,3,2,1,2,4

6

4

3

2

5

27.

1 point

Narrowing control limits from 3s to 2s will increase the probability of making a Type I error.

True

False

28.

1 point

Prior to determining if a process is in control, it is important to see if the process is capable of meeting specifications.

True

False

29.

1 point

If a process that falls out of statistical control continues to produce a very large proportion of output that is acceptable, that process must be highly:

capable

variable

in control

attributable

30.

1 point

A point which is outside of the lower control limit on a c-chart:

should be investigated because an assignable cause of variation might be present

should be ignored because it signifies better-than-average quality

is an indication that no cause of variation is present

is impossible since the lower control limit is zero

should be ignored unless another point is outside that limit