Question

start 0:00
1 multiple choice 0:40
2 multiple choice 1:10
3 multiple choice 2:10
4 multiple choice 3:10
finish 4:23
what is the variable that is directly manipulated by the scientist called?
control variable
dependent variable
extraneous variable
independent variable

Explanation:

• A control variable is held constant, not manipulated.
• A dependent variable is measured, not manipulated.
• An extraneous variable is an unwanted, uncontrolled factor.
• An independent variable is intentionally changed/manipulated by the researcher to test its effect.

Answer:

Independent variable