Dr. Harzem is studying the effects of drugs on memory. He varies the amount of the drug subjects are given. Then he gives his subjects a list of 100 nonsense words and measures their memory ability by asking them to write down all the nonsense words that they can recall in two minutes. Which of the following statements is true about this study?
A) The independent variable is the number of words that subjects can recall.
B) Dr. Harzem's study has one control group and two experimental groups.
C) The control group in this study is given 100 words to memorize.
D) Dr. Harzem has operationally defined variables.
E) The experiment is confounded by the use of nonsense words.

Question

Quizplus · Accepted Answer

Dr. Harzem has operationally defined variables by specifying the exact amount of the drug given to subjects and by measuring memory ability through the recall of nonsense words within a set time frame. This operational definition allows for the clear manipulation and measurement of variables.

Dr Harzem Is Studying the Effects of Drugs on Memory