Lori Henderson runs a specialty ski clothing shop outside of
Boone, North Carolina. She must place her order for ski parkas well
in advance of ski season because the manufacturer produces them in
the summer months. Brenda needs to determine whether to place a
large, medium, or small order for parkas. The number sold will
depend largely on whether the area receives a heavy, normal, or
light amount of snow during the ski season. The following table
summarizes the payoffs Brenda expects to receive under each
scenario.
Brenda estimates the probability of heavy, normal, and light snowfalls as 0.25, 0.6, and 0.15, respectively.
a. What decision should be made according to
the maximax decision rule?
SelectSmall orderMedium orderLarge orderItem 1
b. What decision should be made according to
the maximin decision rule?
SelectSmall orderMedium orderLarge orderItem 2
c. What decision should be made according to
the minimax regret decision rule?
SelectSmall orderMedium orderLarge orderItem 3
d. What decision should be made according to
the EMV decision rule?
SelectSmall orderMedium orderLarge orderItem 4
e. What decision should be made according to
the EOL decision rule?
SelectSmall orderMedium orderLarge order
Answer:
(a) Large Order
(b) Medium Order
(c) Medium Order
(d) Medium Order
(d) Medium Order
Solution is given below:
(a) Maximax :
Amount of Snow | ||||
Size of Orders | Heavy | Normal | Light | Maximum |
Large | 10 | 7 | 3 | 10 |
Medium | 8 | 8 | 6 | 8 |
Small | 4 | 4 | 4 | 4 |
Out of the Maximum values 10 is the maximum value of Large size.
(b) Maximin:
Amount of Snow | ||||
Size of Orders | Heavy | Normal | Light | Minimum |
Large | 10 | 7 | 3 | 3 |
Medium | 8 | 8 | 6 | 6 |
Small | 4 | 4 | 4 | 4 |
Out of the Minimum values, 6 is the maximum value of Medium size.
(c) Minmax Regret:
Regret Table:
Amount of Snow | ||||
Size of Orders | Heavy | Normal | Light | Maximum |
Large | 0 | 1 | 3 | 3 |
Medium | 2 | 0 | 0 | 2 |
Small | 6 | 4 | 2 | 6 |
Out of the Maximum regret values 2 is the minimum value of Medium size.
(d) EMV:
Amount of Snow | ||||
Size of Orders | Heavy | Normal | Light | EMV |
Probability | 0.25 | 0.6 | 0.15 | |
Large | 10 | 7 | 3 | 7.15 |
Medium | 8 | 8 | 6 | 7.7 |
Small | 4 | 4 | 4 | 4 |
Out of the EMV values, 7.7 is the maximum value of Medium size.
(e) Expected Opportunity Loss
Regret Table | ||||
Amount of Snow | ||||
Size of Orders | Heavy | Normal | Light | Expected Regret |
Probability | 0.25 | 0.6 | 0.15 | |
Large | 0 | 1 | 3 | 1.05 |
Medium | 2 | 0 | 0 | 0.5 |
Small | 6 | 4 | 2 | 4.2 |
Out of the Expected Regret values, 0.5 is the minimum value of Medium size.
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