Question

what is an independent variable?
the observation made that began the experiment
the variable that is changed and being tested
the information that you record or observe

Explanation:

To determine the correct definition of an independent variable, we analyze each option:

• The first option refers to an initial observation, not a variable definition.
• The second option: In experimental design, the independent variable is the one that the experimenter manipulates (changes) and tests to see its effect on the dependent variable.
• The third option describes data collection (observations/records), not a variable.

So the correct description of an independent variable is the variable that is changed and being tested.

Answer:

the variable that is changed and being tested (the second option)