Question

1. a variable that is purposely changed or manipulated in an investigation is *

a. dependent variable
b. independent variable
c. controlled variable
d. non - variable

Explanation:

In an investigation, the independent variable is the one that is deliberately changed or manipulated. The dependent variable depends on the independent variable. A controlled variable is kept constant. A non - variable is not a standard term in this context.

Answer:

B. independent variable