ISYE-6644 Exam Questions with Verified
Correct Answers
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
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.).
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!
TRUE
Arena has a built-in Input Analyzer tool that allows for the fitting of certain
distributions to data.
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.
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.
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.
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.
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
(b) Larger sample sizes
(c) Somewhat lower achieved Pr(CS)
(d) A larger indifference zone
(e) Lower confidence in your selection
b
In Arena, you can use a single DECIDE module to route customers to that one of four
servers having the smallest queue.
TRUE
TRUE or FALSE? In Arena, you can use the expression EXPO(3) to generate
exponential interarrival times having a mean of 1/3.
FALSE. The mean of an EXPO(3) is 3.
Correct Answers
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
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.).
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!
TRUE
Arena has a built-in Input Analyzer tool that allows for the fitting of certain
distributions to data.
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.
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.
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.
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.
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
(b) Larger sample sizes
(c) Somewhat lower achieved Pr(CS)
(d) A larger indifference zone
(e) Lower confidence in your selection
b
In Arena, you can use a single DECIDE module to route customers to that one of four
servers having the smallest queue.
TRUE
TRUE or FALSE? In Arena, you can use the expression EXPO(3) to generate
exponential interarrival times having a mean of 1/3.
FALSE. The mean of an EXPO(3) is 3.
