ISYE6644 FINAL EXAM NEWEST ACTUAL EXAM WITH COMPLETE QUESTIONS AND DETAILED

ISYE6644 FINAL EXAM NEWEST ACTUAL EXAM WITH C ./ ./ ./ ./ ./ ./ ./




OMPLETE QUESTIONS AND DETAILED ANSWERS GRAD ./ ./ ./ ./ ./




ED A ./




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
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and Y are independent random variables -
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correct answer
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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
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:00 p.m. (even though we stopped allowing customers to enter the system at 6:00 p.m.). -
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correct answer
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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 th
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e two visits! - correct answer
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TRUE ./ ./ ./ ./ ./




Arena has a built-in Input Analyzer tool that allows for the fitting of certain distributions to data. -
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correct answer
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TRUE ./ ./




The Kolmogorov- ./




Smirnov test can be used both to see (i) if data seem to fit to a particular hypothesized distribution and (ii) i
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f the data are independent. - correct answer
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FALSE. (It's just a goodness-of-fit test.)
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Welch's method is a graphical technique to estimate truncation (initialization bias) points for steady-
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state simulation. - correct answer TRUE
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If you are using a ranking-and-
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selection procedure and two competitors happen to fall within the indifference-
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zone, then you don't really care too much which one you end up selecting. -
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correct answer
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TRUE. That's why it's called the IZ!
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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 other
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s. - correct answer
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TRUE ./ ./

, Suppose, when designing a ranking-and- ./ ./ ./ ./




selection procedure, you have decided to increase the desired probability of correct selection compared t
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o a previous run of the procedure. What can you expect? (a) Sample sizes that are about the same
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(b) Larger sample sizes
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(c) Somewhat lower achieved Pr(CS)
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(d) A larger indifference zone
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(e) Lower confidence in your selection - correct answer
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b



In Arena, you can use a single DECIDE module to route customers to that one of four servers having the sm
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allest queue. - correct answer TRUE
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TRUE or FALSE? In Arena, you can use the expression EXPO(3) to generate exponential interarrival times h
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aving a mean of 1/3. - correct answer ./
FALSE. The mean of an EXPO(3) is 3.
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TRUE or FALSE? In Arena, an alternative expression to generate exponential interarrival times having a me
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an of 1/3 is -(1/3)*LN(UNIF(0,1)) -
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correct answer
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TRUE. This is the Inverse Transform Method to generate an observation coming fro
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m Exp(λ = 3). ./ ./ ./




TRUE or FALSE? In Arena, it is possible to set the maximum capacity of a queue from within a SEIZE module
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correct answer
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FALSE. It is only possible to set a maximum queue capacity from within a QUEUE blo
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ck found in the Blocks template. 2
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TRUE or FALSE? In Arena, the expression NORM(-
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1,2)+NORM(3,2) has the same distribution as the expression NORM(2,4) - ./ ./ ./ ./ ./ ./ ./ ./ ./




correct answer
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FALSE. The above expression evaluates to NORM(2,√ 8) since, in Arena, NORM(x,2)
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corresponds to a normal random variate with a mean of x and a standard deviation of 2; so the variance of
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this random variable is 22 = 4.
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TRUE or FALSE? In Arena, it is only possible to use one resource at a time in a PROCESS module. -
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correct answer
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FALSE ./ ./