Question 1

Expected value calculations are long- term results that occur as the result of making a decision over and over again even though in reality, the decision might be made only once.

Accepted Answer

Expected value calculations are indeed theoretical long-term averages of outcomes that would result from repeating a decision many times, even though in practice, the decision might only be made once.

Question 2

Prior probabilities are a revision of posterior probabilities using additional information such as the results of a market survey.

Accepted Answer

Prior probabilities are initial estimates of the likelihood of an event, which can be updated to posterior probabilities after considering additional information or evidence.

Question 3

In decision trees, circle symbols are used to denote payoffs.

Accepted Answer

In decision trees, circle symbols are used to denote decision points or chance nodes, not payoffs. Payoffs are usually represented at the ends of the branches.

Question 4

The expected value without sample information (EVwoSI)represents the expected long- term payoff of making decisions without using sample information.

Accepted Answer

EVwoSI is a decision analysis term that indeed represents the expected long-term payoff or outcome of making decisions without incorporating any additional information that could be obtained from sampling or gathering more data.

Question 5

The expected monetary value (EMV)is the average of the payoffs associated with a particular alternative weighted with the probabilities for each state of nature.

Accepted Answer

The expected monetary value (EMV) is indeed calculated by taking the average of all possible outcomes under a particular decision, where each outcome is weighted by its probability of occurrence. This provides a single metric that represents the average expected payoff of the decision, taking into account the various states of nature and their probabilities.

Question 6

The expected value under certainty (EVUC)provides us with an upper limit for how much we should pay for additional information to improve our decision.

Accepted Answer

The correct term for the upper limit on how much to pay for additional information is the Expected Value of Perfect Information (EVPI), not the Expected Value Under Certainty (EVUC).

Question 7

A decision table displays all possible combinations of alternatives and states of nature associated with a problem, and the payoff that will result from each combination.

Accepted Answer

A decision table is a tabular method of representing all possible combinations of conditions (alternatives) and actions (states of nature) to show the outcome or payoff for each combination, aiding in decision-making processes.

Question 8

The time series component that is often referred to as "noise" because it has no detectable pattern is the _________ component.

Accepted Answer

The random component of a time series is often referred to as "noise" because it consists of irregular fluctuations that do not follow a predictable pattern or trend.

Question 9

A forecasting technique that includes both the trend and seasonality components is

Accepted Answer

Multiplicative decomposition is a forecasting technique that accounts for both trend and seasonality by decomposing a time series into these components.

Question 10

_________ can be described as a "self- correcting" forecasting technique.

Accepted Answer

Exponential smoothing is considered a "self-correcting" forecasting technique because it adjusts future forecasts based on the error of the most recent forecast. This method gives more weight to recent observations while not discarding older observations entirely, allowing it to adapt to changes in the data pattern over time.

Question 11

The expected value with sample information (EVwSI)represents the expected long- term payoff of making decisions using sample information.

Accepted Answer

The Expected Value with Sample Information (EVwSI) quantifies the anticipated benefit or payoff of making decisions based on additional information gathered through sampling or research, reflecting the long-term value of incorporating this information into decision-making processes.

Question 12

The purpose of Bayes' Theorem is to update prior probabilities based on information provided by posterior probabilities.

Accepted Answer

Bayes' Theorem is used to update the probability of a hypothesis based on new evidence, essentially revising prior probabilities into posterior probabilities given the new evidence.

Question 13

The expected value of sample information (EVSI)represents the lower limit of how much you should pay to gather a sample to acquire additional information about the alternatives.

Accepted Answer

The expected value of sample information (EVSI) represents the maximum amount you should be willing to pay for additional information before deciding among alternatives, not the lower limit.

Question 14

The newsvendor problem is a dilemma about how much of a product should be produced when the product has a long lifecycle and the demand for it is certain.

Accepted Answer

The newsvendor problem focuses on determining the optimal inventory level for a product with uncertain demand and a short lifecycle, not a long lifecycle with certain demand.

Question 15

Decision making under certainty is used to choose an alternative when we have probability information for each state of nature.

Accepted Answer

Decision making under certainty involves choosing an alternative when the outcome of each alternative is known with certainty, without the need for probability information for each state of nature.

Question 16

The expected value under risk (EVUR)is the expected monetary value that corresponds to the best alternative when making a decision under risk.

Accepted Answer

EVUR is the expected monetary value that corresponds to the best alternative when making a decision under risk.

Question 17

Decision making under uncertainty is the procedure of choice when we have no information about the probability for each state of nature.

Accepted Answer

Decision making under uncertainty involves making choices without knowing the probabilities of the various states of nature, implying a lack of precise information about how likely different outcomes are.

Question 18

The expected value of perfect information (EVPI)represents the expected payoff we will realize if we have prior knowledge about which state of nature will occur.

Accepted Answer

The answer of The expected value of perfect information (EVPI)represents...

Question 19

When determining the payoffs for a decision table with order quantity as the alternative and demand as the state of nature, the quantity sold will always be the maximum of the order quantity and demand.

Accepted Answer

The quantity sold will be the minimum of the order quantity and demand, as you cannot sell more than you have ordered or more than there is demand for.

Question 20

The Hurwicz criterion allows the decision maker to choose the level of profit he or she wants to achieve by choosing a, the index of optimism.

Accepted Answer

The Hurwicz criterion does not allow the decision maker to choose the level of profit directly; instead, it allows the decision maker to adjust their level of optimism or pessimism towards uncertainty by choosing a coefficient (alpha, α), which is applied to the best and worst outcomes to make a decision.

Quiz 16: Forecasting Techniques and Analysis for Time Series Data