Use the following to answer question: 
-(Table: The Production Possibilities for Tractors and Crude Oil) Use Table: The Production Possibilities for Tractors and Crude Oil.In the United States,the opportunity cost of producing 40 tractors is _____ barrels of crude oil.
Definitions:
Social Group
A collection of individuals who interact with one another, share similar characteristics, and collectively have a sense of unity or identity.
Spurious
Describes something that is not genuine, authentic, or true; often used in statistics to refer to coincidental correlations between two variables that are actually caused by a third variable.
Control Variable
In experimental research, a variable that is kept constant to test the relative impact of an independent variable on a dependent variable.
Immigrant Status
The legal condition of a person who has come to live permanently in a country where they were not born, often impacting their rights and obligations.
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