If a researcher varied the amount of sleep men versus women received and then measured their memory span while controlling for stress, which of the following would be an independent variable (IV), operationally defined dependent variable (DV), attribute variable (EV), and extraneous variable (EV), respectively? (Be careful here.)

A) memory; amount of sleep; stress; sex
B) amount of sleep; memory quality; sex; stress
C) stress; sex; amount of sleep; memory
D) sex; score on memory task; stress; amount of sleep
E) amount of sleep; score on memory task; sex; stress


Ans: E

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