Exam (elaborations)
COB 300 Operations Exam #2 Questions and Answers
- Course
- Institution
COB 300 Operations Exam #2 Questions and Answers
[Show more]
Content preview
COB 300 Operations Exam #2 Questionsand Answers
quality control - Answers -process that evaluates output relative to a standard and takes
corrective action when output doesn't meet standards
acceptance sampling - Answers -approach to quality assurance where inspection is
done before/after production; least progressive approach
process control - Answers -approach to quality assurance where inspection and
corrective action is done during production
continuous improvement - Answers -approach to quality assurance where quality is built
into the process; most progressive approach
inspection - Answers -appraisal of goods or services; used to provide information on the
degree to which items conform to a standard
low-cost, high-volume items (paper clips, roofing nails, wooden pencils) require: -
Answers -little inspection because the cost associated with passing defective items is
quite low and the processes that produce these items are highly reliable so defects are
rare
high-cost, low-volume items require: - Answers -more intensive inspection; automated
inspection is an option that can be used
quality conformance - Answers -product or service conforms to specifications
statistical process control (SPC) - Answers -statistical evaluation of the output of a
process; used to decide if a process is in control or if corrective action is needed
random variation - Answers -natural variation in the output of a process, created by
countless minor factors; common variability (variations are so minor that it is
unimportant to attempt to eliminate them)
assignable variation - Answers -in process output, a variation whose cause can be
identified; non-random variation
sampling distribution - Answers -theoretical distribution of sample statistics; most
frequently used is normal distribution
, central limit theorem - Answers -distribution of sample averages tends to be normal
regardless of the shape of the process distribution
How is control achieved? - Answers -by checking a portion of the goods or services,
comparing the results to a predetermined standard, evaluating departures from the
standard, taking corrective action when necessary, and following up to ensure that
problems have been corrected
control chart - Answers -time-ordered plot of sample statistics, used to distinguish
between random and nonrandom variability; has upper and lower limits to define range
of acceptable variation from the sample statistic
control limits - Answers -dividing lines between random and nonrandom deviations from
the mean of the distribution
Type I error - Answers -concluding a process is not in control when it actually is; also
referred to as alpha risk
Type II error - Answers -concluding a process is in control when it is not
variables - Answers -generate data that are measured (amount of time needed to
complete a task, length or width of a part)
attributes - Answers -generate data that are counted (ex number of defective parts in a
sample, the number of calls per day)
mean control chart/x-bar chart - Answers -control chart used to monitor the central
tendency of a process
upper control limit (UCL) for x-bar chart - Answers -x-bar-bar + z(standard deviation of
x-bar)
lower control limit (LCL) for x-bar chart - Answers -x-bar-bar - z(standard deviation of x-
bar)
standard deviation of x-bar - Answers -process standard deviation/square root(sample
size)
range control chart - Answers -control chart used to monitor process dispersion
upper control limit (UCL) for R-chart - Answers -D4(R-bar)
lower control limit (LCL) for R-chart - Answers -D3(R-bar)
p-chart - Answers -control chart for attributes, used to monitor the proportion of
defective items in a process
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller millyphilip. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67096 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now