Which of the following could be an independent variable in an ...

[natalie2426]

Which of the following could be an independent variable in an experimental study? (Select all that apply.)
 
  a. Quality of life
  b. The percentage of moisture in the inspired air the subject breathes
  c. The researcher's preference for quantitative versus qualitative methodologies
  d. Wearing a hat with a large brim
  e. Seizure activity during the experiment

Question 2

Which of the following are operational definitions? (Select all that apply.)
 
  a. Length of smoking cessation is the subject's statement of how long it has been since the subject last smoked tobacco.
  b. Pain is whatever the patient says it is, whenever the patient says it is (Margo McCaffrey).
  c. Imagination is the ability to see what will be, not what is.
  d. Startle is the distance the research subject moves when a puppet tarantula is dropped into his field of view, in front of a computer screen.
  e. Nausea is the number the subject provides, on a 0- to 10-point numerical scale, in response to being asked how nauseated the subject is.

[cdmart10]

Answer to Question 1

ANS: B, D
An independent variable is a stimulus or activity that is manipulated or varied by the researcher to create an effect on the dependent variable. The independent variable is also called an intervention, treatment, or experimental variable. A dependent variable is the response behavior, or outcome that the researcher wants to predict or explain.

Answer to Question 2

ANS: A, D, E
An operational definition is derived from a set of procedures and progressive acts that a researcher performs either to manipulate an independent variable or to measure the existence or degree of existence of the dependent variable.

[natalie2426]

Excellent

[helenmarkerine]

Gracias!