A biopsychologist is interested in studying the effects of marijuana on cognitive skills by studying a group of 7 rats.He puts each rat in a maze and measures the time it takes the rat (in minutes) to find the cheese at the end of the maze.He then puts a mask on the rat and has it inhale marijuana smoke for 5 seconds.He then puts the rat back in the maze,and records its time to reach the cheese.Twenty minutes later he puts the rat back in the maze to test for lasting effects of the drug.The tables below summarize the data and part of the data analysis: 
What is the value for the F ratio?
Definitions:
Income-tax System
A government system for assessing and collecting taxes on the income of individuals and businesses.
Ability-to-pay Principle
A taxation principle suggesting that taxes should be levied according to an individual's or entity's capacity to pay, typically measured by income or wealth.
U.S. Labor Force
The total number of people in the United States who are employed or actively seeking employment.
U.S. Governments
The federal government of the United States, composed of three branches: legislative, executive, and judicial.
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