An Experimental Neuropsychologist Wishes to Determine Whether a New Drug

question 2

Multiple Choice

An experimental neuropsychologist wishes to determine whether a new drug (X-9) enhances the growth of new, functional brain tissue after maximal brain growth has already been attained after a period of 1 month and 6 months. Five rats were run in a series of three different mazes. All of the mazes were judged to be of equal difficulty. The time in seconds to solve each maze is recorded for each rat across its three mazes. X-9 was given 2 weeks before testing. A prior study statistically demonstrated that rats not given X-9 did not improve their times. Is there any evidence X-9 works? $\begin{array} { l c c c c c c } \hline & { \text { 1 Month } } & & & \text { 6 Months } \\\hline & \text { Trial 1 } & \text { Trial 2 } & \text { Trial 3 } & \text { Trial 1 } & \text { Trial 2 } & \text { Trial 3 } \\\hline \text { Rat 1 } & 10 & 12 & 5 & 4 & 5 & 4 \\\text { Rat 2 } & 15 & 14 & 8 & 6 & 5 & 4 \\\text { Rat 3 } & 14 & 14 & 7 & 6 & 7 & 7 \\\text { Rat 4 } & 9 & 10 & 5 & 7 & 8 & 8 \\\text { Rat 5 } & 12 & 11 & 4 & 7 & 6 & 7 \\\hline\end{array}$
-The df for the time main effect is

• A)1
• B)2
• C)3
• D)24
• E)29

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Definitions:

Adjusting Entries

Accounting entries made to adjust the books of accounts to reflect the true financial position and performance of a company at the end of a financial period.

Salaries Expense

The total amount recorded by a company for the salaries of its employees.

Salaries Payable

An account reflecting the debts to workers for performed but unpaid work.

Closing Entry

Journal entries made at the end of an accounting period to transfer the balances of temporary accounts to permanent accounts, ultimately resetting the balances of temporary accounts to zero.