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Assignments for Rs.150 each
08627023490
Fall-2013
Master of
Business Administration - MBA Semester 3
QM0012–Statistical
Process Control and Process Capability-4 Credits
(Book ID:
B1242)
Assignment
(60 Marks)
Note: Answers
for 10 marks questions should be approximately of 400 words. Each question is
followed by evaluation scheme. Each Question carries 10 marks 6 X 10=60.
Q1. Explain the concept
of Pareto Chart and Scatter Diagram.
Answer. Pareto chart
Also
called: Pareto diagram, Pareto analysis
A
Pareto chart is a bar graph. The lengths of the bars represent frequency or
cost (time or money), and are arranged with longest bars on the left and the
shortest to the right. In this way the chart visually depicts which situations
are more significant.
Q2. (A). Explain
Poisson distribution. Give any two examples of Poisson distribution.
(b). If 2% of electric
bulbs manufactured by a certain company are defective, find the probability
that in a sample of 200 bulbs i) less than 2 bulbs, ii) more than 3 bulbs are
defective.[e-4 = 0.0183]
Answer. (a) Poisson
Distribution'
A statistical distribution showing the frequency probability
of specific events when the average probability of a single occurrence is
known. The Poisson distribution is a discrete probability distribution that
expresses the probability of a given number of events occurring in a fixed
interval of time and/or space if these events occur with a known average rate
and independently of the time since the last event. The Poisson distribution
Q3. Explain the
procedure generally followed in testing of a hypothesis. Write a detailed note
on One- tailed and Two-tailed tests.
Answer. The various
steps involved in hypothesis testing are stated below:
1. Making a formal statement: The step consists in making a
formal statement of the null hypothesis (H0) and also of the alternative
hypothesis (Ha). This means that hypotheses should be clearly stated,
considering the nature of the research problem
2. Selecting a significance level: The hypotheses are tested
on a pre-determined level of significance and as such the same should be
specified Generally, in practice, either 5% level or 1% level is adopted for
the purpose The factors that
Q4. What is analysis of
variance? State all the assumptions involved in analysis of variance technique.
Explain the structure for one way analysis of variance or one way
classification.
Answer. Analysis of
Variance (ANOVA) is
a statistical method used to test differences between two or more means. It may
seem odd that the technique is called "Analysis of Variance" rather
than "Analysis of Means." As you will see, the name is appropriate
because inferences about means are made by analyzing variance.
In ANOVA setting, the observed variance in a particular
variable is partitioned into components attributable to different
Q5. Explain the
different types of attribute control charts. Distinguish between control charts
for variables and control charts for attributes.
Answer. Attribute
(i.e., counted)
Attribute type control charts use counted data (number of
defects, mistakes, errors, injuries, etc.). When looking at data, attribute
data is always an integer (e.g., 1, 3, 5). Attributes
Charts are types of control chart which is evaluating stability of a
process by charting the count of occurrences of a given event in successive
samples. Control charts are used to regularly monitor a process to determine
whether it is in control. When it is not possible to measure the quality of a
product or service with continuous data, attribute data is
Less common types of
variable control charts include:
·
ANOM -
Analysis of Means Control Chart
·
Colum
- Cumulative Sum Control Chart
·
EWMA -
Exponentially Weighted Moving Average Control Chart
·
Levy
Jennings Control Chart
·
Moving
Average Control Chart
Q6. Explain the
methodology for Statistical Process Control implementation (SPC). What are the
benefits derived from SPC?
Answer. One way to improve a process is to
implement a statistical process control program. Typically used in mass
production, an SPC program enables a
company to continually release a product through the use of control charts
rather than inspecting individual lots of a product.
The purpose of the flowcharting or brainstorming session is
not to redevelop SPC. SPC is a commonly used technique, and its use and
benefits can be reviewed in many quality assurance journals. The working group
should have a basic understanding of SPC and realize that it is developing a
system built on using the charts and ensuring control of the ancillary
activities that support them.
Solved
assignments for Rs.150 each
08627023490
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