In a classic oil-drilling example, you are trying to decide whether to drill for oil on a field that might or might not contain any oil. Before making this decision, you have the option of hiring a geologist to perform some seismic tests and then predict whether there is any oil or not. You assess that if there is actually oil, the geologist will predict there is oil with probability 0.85 . You also assess that if there is no oil, the geologist will predict there is no oil with probability 0.90. Please answer the two questions below, as I am trying to ensure that I am correct.  1. Why will these two probabilities not appear on the decision tree? 2. Which probabilities will be on the decision tree?

Microeconomic Theory
12th Edition
ISBN:9781337517942
Author:NICHOLSON
Publisher:NICHOLSON
Chapter7: Uncertainty
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Problem 7.3P
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In a classic oil-drilling example, you are trying to decide whether to drill for oil on a field that might or might not contain any oil. Before making this decision, you have the option of hiring a geologist to perform some seismic tests and then predict whether there is any oil or not. You assess that if there is actually oil, the geologist will predict there is oil with probability 0.85 . You also assess that if there is no oil, the geologist will predict there is no oil with probability 0.90. Please answer the two questions below, as I am trying to ensure that I am correct. 

1. Why will these two probabilities not appear on the decision tree?

2. Which probabilities will be on the decision tree?

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