CHP 8 EXAM QUESTIONS WITH VALID
SOLUTIONS
A nonconforming unit of work is one that has no defects or errors. - ✔✔False
Attribute measurement requires a much larger sample size than variable measurement to
obtain the same amount of statistical information. - ✔✔True
For variable data, the two important quality measures are the proportion nonconforming
and nonconformances per unit - ✔✔false
Rolled throughput yield is the proportion of conforming units that results from a series of
process steps. - ✔✔True
The total observed variation in production output is the sum of the true process variation
plus variation due to measurement - ✔✔True
A measurement system may be precise but not necessarily accurate at the same time. -
✔✔True
histograms allow you to distinguish between common and special causes of variations -
✔✔false
common and special causes of variation must be eliminated before process capability can
be determined - ✔✔false
The frequency of sampling in pre-control is often determined by dividing the time period
between two successive put-of-control signals by six - ✔✔true
Pre-control should only be used when process capability is no greater than 88 percent of
the tolerance - ✔✔true
, A histogram of data that resembles the normal distribution indicates that the process is in
control. - ✔✔false
If most of the points on a control chart fluctuate randomly between the control limits with
no recognizable pattern, then the process is in statistical control. - ✔✔true
A "hugging the center line" pattern in a control chart can be the result of taking each
sample from a different process but not mixed together. - ✔✔False
If points on a control chart are determined to be the result of special causes, the points
should be eliminated and new control limits should be computed. - ✔✔true
If all sample averages on an -chart fall within the control limits, all output will be
conforming. - ✔✔False
The larger the sample size, the narrower the control limits. - ✔✔True
Process capability indices can be computed from data in an x-chart. - ✔✔ True
A better alternative to the -chart to monitor variation is to compute and plot the standard
deviation s of each sample - ✔✔False
A p-chart is used with the attribute data. - ✔✔true
The center line for the np-chart is the average number of nonconforming items per
sample. - ✔✔True
A c-chart is based on the binomial distribution. - ✔✔False
SOLUTIONS
A nonconforming unit of work is one that has no defects or errors. - ✔✔False
Attribute measurement requires a much larger sample size than variable measurement to
obtain the same amount of statistical information. - ✔✔True
For variable data, the two important quality measures are the proportion nonconforming
and nonconformances per unit - ✔✔false
Rolled throughput yield is the proportion of conforming units that results from a series of
process steps. - ✔✔True
The total observed variation in production output is the sum of the true process variation
plus variation due to measurement - ✔✔True
A measurement system may be precise but not necessarily accurate at the same time. -
✔✔True
histograms allow you to distinguish between common and special causes of variations -
✔✔false
common and special causes of variation must be eliminated before process capability can
be determined - ✔✔false
The frequency of sampling in pre-control is often determined by dividing the time period
between two successive put-of-control signals by six - ✔✔true
Pre-control should only be used when process capability is no greater than 88 percent of
the tolerance - ✔✔true
, A histogram of data that resembles the normal distribution indicates that the process is in
control. - ✔✔false
If most of the points on a control chart fluctuate randomly between the control limits with
no recognizable pattern, then the process is in statistical control. - ✔✔true
A "hugging the center line" pattern in a control chart can be the result of taking each
sample from a different process but not mixed together. - ✔✔False
If points on a control chart are determined to be the result of special causes, the points
should be eliminated and new control limits should be computed. - ✔✔true
If all sample averages on an -chart fall within the control limits, all output will be
conforming. - ✔✔False
The larger the sample size, the narrower the control limits. - ✔✔True
Process capability indices can be computed from data in an x-chart. - ✔✔ True
A better alternative to the -chart to monitor variation is to compute and plot the standard
deviation s of each sample - ✔✔False
A p-chart is used with the attribute data. - ✔✔true
The center line for the np-chart is the average number of nonconforming items per
sample. - ✔✔True
A c-chart is based on the binomial distribution. - ✔✔False
