ISYE 6644 ACTUAL MIDTERM EXAM

ISYE 6644 ACTUAL MIDTERM EXAM

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PASS | ISYE 6644 LATEST EXAM [NEW]

A sequence must consist of unique visitation locations.... no repeat visits! - ANSWER- False

You could use the Advanced Set functionality to define a "Set of Sequences" - ANSWER- True

The name of the automatically supplied ARENA attribute that stores a particular entity's sequence is Entity.Sequence? - ANSWER- True

TRUE or FALSE? You SEIZE-DELAY-RELEASE a conveyor. - ANSWER- False

An ENTER module is usually paired with what other module? - ANSWER- LEAVE

Which property is not desirable for a good pseudo-random number generator? - ANSWER- We must be able to look up the series of PRNs from a table. 1 / 3

Which of the following PRN generators aren't very good? - ANSWER- Generators involving physical devices such as coin flips or at least significant digit readings from an atomic clock, random number tables, von Neuman's mid-square method, Fibonacci and additive congruential generators.

TRUE or FALSE? (1XOR1)XOR1 = 1? - ANSWER- True. (1XOR1)XOR1 =

0XOR1 = 1

TRUE or FALSE? There are good PRN generators out there having incredible cycle lengths of over 2^100 - ANSWER- True

TRUE or FALSE? RANDU is a pretty good generator. - ANSWER- False.RANDU has several problems with hyperplanes.

TRUE or FALSE? Alpha =P(Reject Ho|Ho is true) is the probability of a Type 1 error? - ANSWER- True

In the context of evaluating a PRN generator, which kinds of statistical tests are we interested in? - ANSWER- Goodness-of-fit tests, independence tests

If the chi-squared goodness-of-fit statistic is much greater than the relevant quantile, what do we do? - ANSWER- Reject the goodness-of-fit test and declare that the PRNs are probably not uniform.

TRUE or FALSE? It's actually a good thing for you to be able to reproduce a sequence of PRNs, should you so desire. - ANSWER- True

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YES or NO? Does Xi = (Xi-1 + 12)mod(13) have full period? - ANSWER- Yes, it trivially cycles through 0,1,2,....,11

Which uniform generator was recommended in class, at least as a desert island generator? - ANSWER- Xi = 16807mod(2^31 - 1)

TRUE or FALSE? There are some great PRN generators out there with incredible cycle lengths ~ 2^191 and even 2^19937 - ANSWER- True

Which of the following statements about the RANDU generator is true? - ANSWER- Something just ain't right about that boy, the generator is given by Xi = 65539Xi-1mod(2^31), the PRNs appear at first glance to be uniform, but funny things happen when you look at the plots of the PRNs in multiple dimensions, the PRNs are distributed on just 15 hyperplanes.

Suppose the guy on trial is actually guilty but you incorrectly acquit him. So you've incorrectly accepted the null hypothesis of innocence. What type of error have you just made - Type I or Type II? - ANSWER- Type II - You have incorrectly accepted the null hypothesis of innocence.

TRUE or FALSE? Unif(0,1) pseudo-random numbers can be used to generate pretty much any other random variates, e.g. exponential, normal, and Poisson. - ANSWER- True

TRUE or FALSE? You can pre-assign a service time as an attribute before you actually get to the server that you'll be using. - ANSWER- True

TRUE or FALSE? If you have Create module generating one-at-a-time customer arrivals, then it is not possible to use a different Create module with 4-at-a-time customer arrivals. - ANSWER- False

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