4.2 Supply and Demand Analysis: An Oil Import Fee
Refer to the information provided in Figure 4.4 below to answer the questions that follow. 
Figure 4.4
-Refer to Figure 4.4. Assume that initially there is free trade. The price of oil in the United States will increase to $150 per barrel if the United States then imposes ________ tax per barrel of imported oil.
Definitions:
F-test
A statistical test used to determine if there are significant differences between the variances of two or more groups.
Environmental Conditions
The various physical and biological factors that affect the organisms and the ecosystem in a specific area.
Temperature
A physical quantity representing the subjective perceptions of hot and cold, measured by a thermometer.
F Ratio
A statistical measure used in the analysis of variance (ANOVA) to determine the ratio of variance between groups to the variance within groups.
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