CS108L Spring 2013
Week 7: Quiz
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What is a computer simulation?
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A device that can be used to simulate a computer.
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A computer code that explores how a computer can be used in the real world.
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****Running the computer model to simulate the passage of time and exploring the behavior of the modeled system.
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An abstraction of the real world that captures the elements of the system and the behavior of the elements being modeled.
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Something that you teacher tells you to do on the computer.
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What is a deterministic computer simulation?
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A simulation that gives you numbers for an answer.
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A simulation that actually can be used to determine something.
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A simulation that is being run by people who are determined to get the correct answer.
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***A simulation that does not involve randomness and provides single outputs for each set of inputs.
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A simulation that was written by a very determined programmer.
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What is a stochastic computer simulation?
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***A simulation that can produce different outputs for the same set of inputs because randomness is involved.
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A simulation that can be used to develop an understanding of problem based on the chaste system in India.
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A simulation that uses the stochastic algorithm developed by a programmer named Stochast.
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A simulation with inputs that are set using a uniform random distribution.
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A simulation with inputs that are set using a normal random distribution.
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When performing a simulation using a stochastic model and analyzing the results of the simulation which of the following should you NOT do?
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Sweep or vary the input parameters.
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Repeat simulation runs at each set of input parameters since stochastic models involve randomness and that may vary the outcome..
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Record the input parameters that were used to generate each output obtained.
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***Randomly select input parameters until you get the results you are looking for.
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Test the model by running it with input parameters for which the correct output is known.
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Why do you need to repeat runs of a stochastic simulation at the same input parameters?
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Because you teacher wants to torture you, repeatedly.
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Because that is what the computer lab tells you to do.
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Because you are not sure you entered the input parameters correctly.
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Because a model that is stochastic, from Greek stokhastikos which means “capable of guessing”, must be validated by showing that the same input parameters always produce the same output.
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***Because you must average the results for each set of input parameters to get a representative answer.
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Which of these things is negative feedback for a population of rabbits?
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Plants that rabbits can eat which grows more quickly in the presence of rabbit poop.
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***A debilitating disease that the rabbits catch when they encounter another rabbit.
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A non-native, rodent species that eats a different kind of plant than the rabbits eat.
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Punishing the rabbits with a small electric shock when they try to exit their safe and protected habitat.
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All of the above.
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You define a breed in NetLogo by:
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Defining it anywhere in your program using the “set” command, as long as it is defined before you use the breed.
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Defining it anywhere in your program using the “let” command, as long as it is defined before you use the breed.
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Defining it by setting its shape in the setup procedure.
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***Defining it at the top of your program using the “breed” command.
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Defining it anywhere in your program using the “breed” command, as long as it is defined before you use the breed.
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What are the three ways to create turtles in NetLogo?
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Create, Spawn, Breed
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***Create, Sprout and Hatch
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Spawn, Sprout, Breed
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Hatch, Spawn, Make
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Procreate, Sprout, Breed
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Will the following NetLogo code hatch any turtles?
turtles-own [energy]
to go-one-time
set energy 0
ask turtles
[
forward 1
set energy (energy – 1)
if (energy < 0) [ die ]
if (pcolor = green) [ set energy (random 25) ]
if energy > 10 [hatch 1]
]
end
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Yes all the turtles will give birth to turtles.
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Yes, on average, a bit more than half of the turtles will give birth.
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Yes, on average, a bit less than half of the turtles will give birth.
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Maybe yes, maybe no. It depends on the value of (random 25) for each turtle.
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***No, the turtles will all die because their energy level drops to less than 0 when the turtle moves
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The reading of Blown-to-Bits says we leave digital fingerprints when we use our computers and access the Internet because_____
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***Accessing the Internet means downloading information to the computer, some part of the system must know where we are to do that. This leaves a trail.
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People often choose to fill out forms on the Internet and enter personal information.
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People often choose to use school or company owned computers to access the Internet and these computers are often monitored.
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People sometimes use computers with viruses or other malware which can track all the user’s accesses.
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Even in a dry climate like New Mexico, people always have some oils on their fingers – this is especially true when eating at the keyboard.
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