In a Study of the Effect of Fatigue on Task

question 135

Multiple Choice

In a study of the effect of fatigue on task performance, participants were asked to complete a series of puzzles. One day, all participants completed puzzles after 24 hours without sleep. On another day, the same participants completed puzzles after sleeping for at least eight hours. What can be said about the research methods used in this study?

• A)The control and experimental groups were entirely confounded with one another.
• B)There was no control group, so the study is seriously flawed.
• C)Participants served as their own control group, in order to examine the effect of the independent variable under different conditions for the same individuals.
• D)Participants provided their own matched controls, so that the researchers were unable to determine whether the independent variable had any functional impact.

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Definitions:

Dividend Growth Model

A method for valuing a stock by assuming constant dividend growth and using future dividends to forecast stock price.

SML Approach

A method used in finance to determine the expected return of an investment with respect to its risk, as represented by its beta.

Risk-Free Rate

The earnings from an investment that carries no possibility of losing money, usually linked to government-issued bonds.

Weighted Average Cost

A method used to calculate the average cost of a group of assets, taking into account the varying weights of each asset.