Exam 6: Decision Models

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The optimal decision can change merely by introducing an additional, non-optimal alternative when using the minimax regret criterion.

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The difference between "risk" and "uncertainty" in decision analysis alludes to the difference between:

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C

What is the "principle of insufficient reason"?

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(This principle implies the decision maker's belief that no outcome is more likely than any other, i.e., that all possible outcomes are equally likely.Note this is not the same as professing total ignorance concerning outcome likelihoods.)

An aggressive decision maker would prefer the minimax regret criterion over the maximin criterion.

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Utilities are generally well approximated by monetary payoffs for:

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Which of the following criteria represents an aggressive/optimistic approach?

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The indifference approach for assigning utility values asks the decision maker which of two alternatives is preferred: the payoff under consideration or a chance at the highest payoff with a risk of the lowest payoff.

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The objective function in game theory is to maximize the value of the game.

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The Bayesian approach in decision analysis:

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In some cases, the Expected Value of Sample Information can exceed the Expected Value of Perfect Information.

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Consider the payoff table in problem 7.The optimal decision under the minimax regret criterion is:

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Consider the payoff table in problem 16.Suppose that each state of nature is equally likely to occur and that two indicators, I1 and I2, are possible.The conditional probabilities for indicator I1 given the states of nature are as follows: P(I1|S1) = .1, P(I1|S2) = .2, P(I1|S3) = .3, and P(I1|S4) = .4.The expected value of sample information is:

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The expected value of perfect information (EVPI):

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The decision maker who is neither optimistic nor pessimistic might use which criterion?

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Consider the following payoff table in which D1 through D4 represent decisions, S1 through S4 represent states of nature, and the values in the cells represent profits. D1 D2 D3 D4 S1 S2 S3 S4 -20 40 60 100 30 120 60 -50 30 30 40 40 10 -60 80 70 The optimal decision under the maximax criterion is:

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Consider the following payoff table in which D1 through D4 represent decisions, S1 through S4 represent states of nature, and the values in the cells represent profits. D1 D2 D3 D4 S1 S2 S3 S4 30 20 -50 100 60 120 40 -80 20 0 60 80 40 -60 80 80 Suppose that each state of nature is equally likely to occur.The expected value of perfect information is:

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Consider the decision analysis problem with states of nature Si, decision alternatives Aj, and the following payoff table: S2 S3 S4 A1 55 51 50 38 A2 39 42 42 48 A3 45 59 57 35 What is the preferred alternative when using the: A.maximin criterion? B.maximax criterion? C.minimax regret criterion? D.principle of insufficient reason?

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What is a "zero-sum" game? Give an example of a zero-sum game and an example of a game which is not zero-sum.

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Suppose in a decision analysis problem, the decision maker's decision is based only on the expected monetary value of the possible outcomes.What does this imply, concerning the decision maker's utility function? Explain.

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The fact that so many people enter sweepstakes and/or buy lottery tickets demonstrates the difference between:

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