GSCM 209 Final Exam, Latest complete solutions

1) (TCO 8) What are the three parts of a wait-line system?
The Three parts of a wait line system involves
1. Arrivals or inputs to the system. These have characteristics such as population size, behavior, and a
statistical distribution.
2. Queue discipline, or the waiting line itself. Characteristics of the queue include whether it is limited or
unlimited in length and the discipline of people or items in it.
3. The service facility. Its characteristics include its design and the statistical distribution ofservice times
2) (TCO 9) What limits the use of a graphical solution to LP?
Linear programming is applicable only to problems where the
constraints and objective function are linear i.e., where they can be
expressed as equations which represent. In real life situations, when
constraints or objective functions are not linear, this technique cannot
be used.
Moreover weather conditions and other uncertainities are also not taken into
account .
3) (TCOs 11 and 12) What are third and forth steps in the simplex solution procedure?
The third step is to Convert all the inequations of the constraints into equations by introducing
slack/surplus variables in the constraints. Put the costs of these variables equal to zero.
The fourth Step is to Obtain an initial basic feasible solution to the problem and put it in the first
column of the simplex table
4)(TCO 10) In LP, what is the feasible region?
In Linear programming a feasible region is the set of all the possible points of an
optimization problem that satisfy the problem's constraints, potentially including inequalities,
equalities, and integer constraints.
a feasible region, feasibleset, search space, or solution space is the set of all possible points
(sets of values of the choice variables) of anoptimization problem that satisfy the problem's
constraints, potentially including inequalities, equalities, and integer constraints.
5) (TCOs 15 and 16) Define PERT and CPM.
A PERT Chart or Program Evaluation and Review Technicque is a project management
tool which has been designed to analyze, schedule and coordinate the tasks within a
given project.
A CPM or critical path method is a project management technique which defines the
critical and non-critical tasks with the goal of preventing time-frame problems
and process bottlenecks. The CPM is ideally suited to projects consisting of
numerous activities that interact in a complex manner.
6) (TCO 16) What is the two-pass process for determining scje hedules?
The two pass process for determining schedules in the forward pass and the backward
pass.
The forward pass is being used to determine the Early Starts (ES) whereas the
backward pass is for Late Finishes (LF)
7) (TCOs 3, 4, and 5) What is the difference between coefficient of correlation and
coefficient of determination?
Coefficient of correlation is “R” value which is given in the summary table in the Regression
output. R square is also called coefficient of determination. Multiply R times R to get the R
square value. In other words Coefficient of Determination is the square of Coefficeint of
Correlation.
Correlation measures linear relationship between two variables, while coefficient
of determination (R-squared) measures explained variation.