Question

multiple choice question
experiments involve ______ one variable and observing the effect on another variable.

○ measuring
○ changing
○ confounding
○ correlating

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Explanation:

In experiments, the independent variable is manipulated (changed) to observe its effect on the dependent variable. "Measuring" is for collecting data, "confounding" refers to unwanted variables, and "correlating" is for finding relationships without manipulation. So "changing" fits.

Answer:

B. changing