Ms.C. (Statistics) (Semester IV) (CBCS) Examination, 2017
INDUSTRIAL STATISTICS
Day Date: Friday, 21-04-2017 Max. Marks: 70
Time: 2:30 PM to 05.00 PM
N.B. Attempt five questions.
Q. No. and Q. No are compulsory.
Attempt any three from Q. No. to Q. No.
Figures to the right indicate full marks.
Q.1 Choose correct alternative: 05
Assignable causes are
Not as important as natural causes
Within the limits of control chart
Also referred to as chance causes
Causes of variation that can be identified and removed.
2 In most acceptance sampling plans, when a lot is rejected, the
entire lot is inspected and all defective items are replaced.
When using this technique, the AOQ
Becomes a larger fraction Becomes a smaller fraction
Is not affected None of these
3 Which of the following is useful in data collection activity?
Control chart Check sheet Histogram Pareto chart
4 Which of the following is useful in searching the root cause of
a problem?
Ishekawa diagram Control chart
Pareto chart Defect concentration diagram
5 In the use of limits, the false alarm will be generated 27
numbers of time out of points.
100 370 1000 10000
Fill in the blanks. 05
Quality is inversely proportional to
V-mask procedure is used to implement chart.
To classify nonconformities according to severity system
is used.
The S chart is preferred over R chart if the sample size is
If then the process is centered at
State the following sentence are True or False: 04
Normality assumption of process data is made for
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nonparametric control charts.
For Shewhart control chart the distribution of run length is
geometric.
When process goes out-of-control, ARL of good control chart
should increase.
Scatter plot identifies the relationship between two variables.
Q.2 Answer the following: 06
Describe a single sampling plan for attributes.
Describe conforming run length chart.
Write short notes on the following: 08
Producer's risk and consumer's risk
DMAIC cycle
Q.3 Define ARL and OC function of a control chart. Obtain the same
for chart assuming normality of process with known standards.
07
List seven SPC tools and explain in detail any two of off-line tools. 07
Q.4 Explain the process capability index . Also explain the
procedure of estimating the same.
07
Discuss the nonparametric sign control chart for location. 07
Q.5 Describe construction and operation of tabular CUSUM for
monitoring process mean.
07
Discuss in detail np chart. Obtain OC function of the same. 07
Q.6 Stating the underlying assumptions, explain the construction and
operation of sequential sampling plan for attributes.
07
Explain the variable sampling plan when lower specification is
given and standard deviation is known.
07
Q.7 Explain the basic concepts of six-sigma methodology. Also
explain the benefits of implementing the same.
07
Stating the assumptions, explain the construction and operations
of the Hetelling's chart to monitor process mean vector.