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: 
This study represents a _____-subjects design.
Definitions:
Accounts Receivable
Money owed to a company by its customers for goods or services delivered but not yet paid for.
Retained Earnings Account
An equity account on the balance sheet that represents the accumulated net income of a company that has not been distributed to shareholders as dividends.
Dividends Account
An account in the ledger that records dividends paid out to shareholders by a company.
Retained Earnings Account
An equity account that represents the accumulated portion of net income not distributed to shareholders in the form of dividends.
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