ISYE 6644 - final prep2 QUESTIONS WITH |\ |\ |\ |\ |\ |\ |\
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 - CORRECT ANSWERS ✔✔TRUE. (Because f(x,
|\ |\ |\ |\ |\ |\ |\ |\
y) = a(x)b(y) factors nicely, and there are no funny limits.)
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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.). -
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CORRECT ANSWERS ✔✔TRUE — because of the small chance |\ |\ |\ |\ |\ |\ |\ |\ |\
that a callback will occur.
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An entity can be scheduled to visit the same resource twice, with
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
different service time distributions on the two visits! - CORRECT
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ANSWERS ✔✔TRUE |\
Arena has a built-in Input Analyzer tool that allows for the fitting of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
certain distributions to data. - CORRECT ANSWERS ✔✔TRUE
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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. - CORRECT ANSWERS ✔✔FALSE. (It's just
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a goodness-of-fit test.)
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Welch's method is a graphical technique to estimate truncation
|\ |\ |\ |\ |\ |\ |\ |\ |\
(initialization bias) points for steady-state simulation. - CORRECT |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔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. -
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CORRECT ANSWERS ✔✔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. - CORRECT ANSWERS ✔✔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
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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 - CORRECT ANSWERS ✔✔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.). -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔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! - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔TRUE |\
Arena has a built-in Input Analyzer tool that allows for the fitting of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
certain distributions to data. - CORRECT ANSWERS ✔✔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. - CORRECT ANSWERS ✔✔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. - CORRECT |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔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. -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔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. - CORRECT ANSWERS ✔✔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
|\ |\ |\ |\ |\
