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Chapter Quiz
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1
W. Edwards Deming ___________________
A)taught quality control techniques to Japanese companies during the 1950's.
B)would have been very influential but for his very short life.
C)invented control charts and proposed the ISO 9000 standard.
D)suggested that most quality problems could be blamed on labor.
2
Which is an appropriate step in continuous quality improvement?
A)Taking measurements on a variable and keeping careful records.
B)Posting quality banners or company flags where they are visible to all.
C)Castigating the lazy employees for their shoddy workmanship.
D)Sending employees to Motivation Camp taught by expensive consultants.
3
Process control charts were an innovation attributed to
A)Deming in the 1950's.
B)Shewhart in the 1920's.
C)Westinghouse in the 1960's.
D)Pacioli in the 1490's.
4
A Likely reason for inaccurate control limits would include which of the following?
A)The engineering parameter for variance is unknown.
B)The engineers were underpaid for their work.
C)There was insufficient preliminary sampling.
D)Process variation was not zero, as expected.
5
Which is not a characteristic of a p-chart?
A)It shows the number of defects per item being inspected.
B)It measures the fraction of non-conforming items in a sample.
C)It is based on the binomial distribution (or its normal approximation).
D)It will have varying control limits if the sample size is changing.
6
Which is not a tool of statistical quality control?
A)Fishbone diagram.
B)Pareto chart.
C)Attribute control chart.
D)Deming chart.
7
If the subgroup size is n = 4 and the process parameters are µ = 2.75 and σ = .044, the control limits for the chart will be:
A)LCL = 2.684, UCL = 2.816
B)LCL = 2.728, UCL = 2.772
C)LCL = 2.618, UCL = 2.882
8
Find the Cpk index for a process with USL = 550, LSL = 540, µ = 543, and σ = 0.75.
A)1.33
B)2.22
C)1.25
D)1.75
9
Variations in output that are caused by specific temporary events such as machine malfunction are
A)special causes.
B)common causes.
C)out of control causes.
D)All of the above.
10
Variations in process output that are caused by a number of randomly occurring events that are part of the production process are
A)special causes.
B)common causes.
C)out of control causes.
D)all of the above.
11
In statistical process control, a Type I error occurs if we decide that the process is
A)under control when it is out of control.
B)out of control when it is under control.
C)under control when it is under control.
D)out of control when it is out of control.
12
When no point lies outside the control limits of a chart, we conclude that variation in the process is
A)due to special causes and there is not enough evidence to infer that the process is out of control.
B)due to special causes and there is enough evidence to infer that the process is under control.
C)due to common cause and there is enough evidence to infer that the process is out of control.
D)due to common cause and there is not enough evidence to infer that the process is out of control.
13
When a sudden change has occurred in the mean of the process distribution, the result is referred to as
A)a level shift.
B)instability.
C)a cycle.
D)a trend.
14
If the control limits of a control chart are set at 2 standard errors from the centerline instead of the commonly used 3 standard errors, this will result in
A)a decrease in the probability of Type I and Type II error.
B)an increase in the probability of Type I and Type II error.
C)a decrease in the probability of Type I and an increase in the probability of Type II error.
D)an increase in the probability of Type I and a decrease in the probability of Type II error.
15
To tell if the standard deviation of a process has changed, the control charts used are -charts and p-charts
A)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073373699/821189/x.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>-charts and p-charts
B)p-charts and R charts
C)R-charts and s-charts
D)s-charts and <a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073373699/821189/x.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>-charts







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