Question

In: Statistics and Probability

Question 1              (10 marks) A manufacturer of deodorant is about to expand production capacity to make...

Question 1             

A manufacturer of deodorant is about to expand production capacity to make a new product. Four alternative production processes are available. The table below shows estimated profits in pounds for these processes for each of three possible demand levels:

                                   State of Nature

Low Demand

Moderate Demand

High Demand

Action

Process A

50000

250000

750000

Process B

100000

300000

550000

Process C

200000

350000

450000

Process D

150000

300000

400000

  1. Which action is chosen by the maximin criterion?
  2. Which action is chosen by the maximax criterion?
  3. Which action is chosen by the minimax regret criterion?
  4. Suppose the manufacturer obtains information that 30% of products of this type have met high demand, 40% moderate demand and 30% low demand. According to the expected monetary value criterion, which process should be used?

Justify your answers.

Solutions

Expert Solution

Which action is chosen by the maximin criterion?

The conservative approach is to select the best of the worst possible payoffs.

The minimum payoff for each decision alternative is

Minimum payoff
Action Process A 50000
Process B 100000
Process C 200000
Process D 150000

The alternative process C has the maximum of the minimum payoffs. Hence it is the recommended alternative.

ans: Using the maximin criterion, the manufacturer needs to chose the production process C.

Which action is chosen by the maximax criterion?

The optimistic approach, picks the alternative which provides the best of the best possible payoffs

The maximum payoff for each of the alternatives is

Maximum payoff
Action Process A 750000
Process B 550000
Process C 450000
Process D 400000

We can see that the alternative, process A has the best payoff. Hence the recommended alternative is to go for Process A

ans: Using the maximax criterion, the manufacturer needs to chose the production process A.

Which action is chosen by the minimax regret criterion?

First we need to calculate the regret associated with each alternative and state of nature.

The regret is calculated as

Regret of the alternative for a demand type= (Best payoff for a given demand type) - (payoff for the alternative for a demand type)

The best payoff for each demand type is given below

State of Nature
Low Demand Moderate Demand High Demand
Action Process A 50000 250000 750000
Process B 100000 300000 550000
Process C 200000 350000 450000
Process D 150000 300000 400000
Best Payoff 200000 350000 750000

The regret table calculated using

State of Nature
Low Demand Moderate Demand High Demand
Action Process A 200000-50000=150000 350000-250000=100000 750000-750000=0
Process B 200000-100000=100000 350000-300000=50000 750000-550000=200000
Process C 200000-200000=0 350000-350000=0 750000-450000=300000
Process D 200000-150000=50000 350000-300000=50000 750000-400000=350000

The maximum regret for each of the decision alternative is given below

Maximum regret
Action Process A 150000
Process B 200000
Process C 300000
Process D 350000

The alternative Process A has the minimum regret of all. Hence the recommended alternative is process A.

ans: Using the minimax regret criterion, the manufacturer needs to chose the production process A.

Suppose the manufacturer obtains information that 30% of products of this type have met high demand, 40% moderate demand and 30% low demand. According to the expected monetary value criterion, which process should be used?

The expected value for Process A is

The expected value for Process B is

The expected value for Process C is

The expected value for Process D is

We can see that the decision alternative Process A has the highest expected payoff

ans: According to the expected monetary value criterion, Process A should be used


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