ISYE 6644 Midterm Exam Practice Questions with Correct Verified Answers / Isye 6644
Midterm Exam Correctly Answered Practice Questions Latest (New!)
If f(x, y) = cxy for all 0 < x < 1 and 1 < y < 2, where c is whatever value makes this thing integrate to 1,
then X and Y are independent random variables - (answer)TRUE. (Because f(x, y) = a(x)b(y) factors nicely,
and there are no funny limits.)
In our Arena Call Center example, it was possible for entities to be left in the system when it shut down
at 7:00 p.m. (even though we stopped allowing customers to enter the system at 6:00 p.m.). -
(answer)TRUE — because of the small chance that a callback will occur.
An entity can be scheduled to visit the same resource twice, with different service time distributions on
the two visits! - (answer)TRUE
Arena has a built-in Input Analyzer tool that allows for the fitting of certain distributions to data. -
(answer)TRUE
The Kolmogorov-Smirnov test can be used both to see (i) if data seem to fit to a particular hypothesized
distribution and (ii) if the data are independent. - (answer)FALSE. (It's just a goodness-of-fit test.)
Welch's method is a graphical technique to estimate truncation (initialization bias) points for steady-
state simulation. - (answer)TRUE
If you are using a ranking-and-selection procedure and two competitors happen to fall within the
indifference-zone, then you don't really care too much which one you end up selecting. - (answer)TRUE.
That's why it's called the IZ!
TRUE or FALSE? Sequential ranking-and-selection procedures are designed to stop early if one
alternative seems to be way out in front of the others. - (answer)TRUE
Suppose, when designing a ranking-and-selection procedure, you have decided to increase the desired
probability of correct selection compared to a previous run of the procedure. What can you expect? (a)
Sample sizes that are about the same
, ISYE 6644 Midterm Exam Practice Questions with Correct Verified Answers / Isye 6644
Midterm Exam Correctly Answered Practice Questions Latest (New!)
(b) Larger sample sizes
(c) Somewhat lower achieved Pr(CS)
(d) A larger indifference zone
(e) Lower confidence in your selection - (answer)b
In Arena, you can use a single DECIDE module to route customers to that one of four servers having the
smallest queue. - (answer)TRUE
TRUE or FALSE? In Arena, you can use the expression EXPO(3) to generate exponential interarrival times
having a mean of 1/3. - (answer)FALSE. The mean of an EXPO(3) is 3.
TRUE or FALSE? In Arena, an alternative expression to generate exponential interarrival times having a
mean of 1/3 is -(1/3)*LN(UNIF(0,1)) - (answer)TRUE. This is the Inverse Transform Method to generate
an observation coming from Exp(λ = 3).
TRUE or FALSE? In Arena, it is possible to set the maximum capacity of a queue from within a SEIZE
module. - (answer)FALSE. It is only possible to set a maximum queue capacity from within a QUEUE
block found in the Blocks template. 2
TRUE or FALSE? In Arena, the expression NORM(-1,2)+NORM(3,2) has the same distribution as the
expression NORM(2,4) - (answer)FALSE. The above expression evaluates to NORM(2,√ 8) since, in Arena,
NORM(x,2) corresponds to a normal random variate with a mean of x and a standard deviation of 2; so
the variance of this random variable is 22 = 4.
TRUE or FALSE? In Arena, it is only possible to use one resource at a time in a PROCESS module. -
(answer)FALSE
TRUE or FALSE? In Arena, once an entity is defined, it is not possible to change the priority in which it
gets processed by a resource. - (answer)FALSE
Midterm Exam Correctly Answered Practice Questions Latest (New!)
If f(x, y) = cxy for all 0 < x < 1 and 1 < y < 2, where c is whatever value makes this thing integrate to 1,
then X and Y are independent random variables - (answer)TRUE. (Because f(x, y) = a(x)b(y) factors nicely,
and there are no funny limits.)
In our Arena Call Center example, it was possible for entities to be left in the system when it shut down
at 7:00 p.m. (even though we stopped allowing customers to enter the system at 6:00 p.m.). -
(answer)TRUE — because of the small chance that a callback will occur.
An entity can be scheduled to visit the same resource twice, with different service time distributions on
the two visits! - (answer)TRUE
Arena has a built-in Input Analyzer tool that allows for the fitting of certain distributions to data. -
(answer)TRUE
The Kolmogorov-Smirnov test can be used both to see (i) if data seem to fit to a particular hypothesized
distribution and (ii) if the data are independent. - (answer)FALSE. (It's just a goodness-of-fit test.)
Welch's method is a graphical technique to estimate truncation (initialization bias) points for steady-
state simulation. - (answer)TRUE
If you are using a ranking-and-selection procedure and two competitors happen to fall within the
indifference-zone, then you don't really care too much which one you end up selecting. - (answer)TRUE.
That's why it's called the IZ!
TRUE or FALSE? Sequential ranking-and-selection procedures are designed to stop early if one
alternative seems to be way out in front of the others. - (answer)TRUE
Suppose, when designing a ranking-and-selection procedure, you have decided to increase the desired
probability of correct selection compared to a previous run of the procedure. What can you expect? (a)
Sample sizes that are about the same
, ISYE 6644 Midterm Exam Practice Questions with Correct Verified Answers / Isye 6644
Midterm Exam Correctly Answered Practice Questions Latest (New!)
(b) Larger sample sizes
(c) Somewhat lower achieved Pr(CS)
(d) A larger indifference zone
(e) Lower confidence in your selection - (answer)b
In Arena, you can use a single DECIDE module to route customers to that one of four servers having the
smallest queue. - (answer)TRUE
TRUE or FALSE? In Arena, you can use the expression EXPO(3) to generate exponential interarrival times
having a mean of 1/3. - (answer)FALSE. The mean of an EXPO(3) is 3.
TRUE or FALSE? In Arena, an alternative expression to generate exponential interarrival times having a
mean of 1/3 is -(1/3)*LN(UNIF(0,1)) - (answer)TRUE. This is the Inverse Transform Method to generate
an observation coming from Exp(λ = 3).
TRUE or FALSE? In Arena, it is possible to set the maximum capacity of a queue from within a SEIZE
module. - (answer)FALSE. It is only possible to set a maximum queue capacity from within a QUEUE
block found in the Blocks template. 2
TRUE or FALSE? In Arena, the expression NORM(-1,2)+NORM(3,2) has the same distribution as the
expression NORM(2,4) - (answer)FALSE. The above expression evaluates to NORM(2,√ 8) since, in Arena,
NORM(x,2) corresponds to a normal random variate with a mean of x and a standard deviation of 2; so
the variance of this random variable is 22 = 4.
TRUE or FALSE? In Arena, it is only possible to use one resource at a time in a PROCESS module. -
(answer)FALSE
TRUE or FALSE? In Arena, once an entity is defined, it is not possible to change the priority in which it
gets processed by a resource. - (answer)FALSE
