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The researcher changed the independent variable.
Control variables are kept constant throughout an experiment to ensure that any changes in the dependent variable are due to the manipulation of the independent variable. Experimental variables, on the other hand, are the factors that are deliberately changed by the researcher to observe their effect on the dependent variable.
The one factor that differs between a control group and an experimental group in a controlled experiment is the variable being tested or manipulated. The control group serves as a baseline with no intervention, while the experimental group is exposed to the variable being studied. This allows researchers to compare the outcomes and determine the effect of the variable.
The factor being tested in an experiment is the independent variable, which is the variable that is manipulated or changed by the researcher. The control variable is a variable that is held constant to prevent it from affecting the outcome of the experiment. The data collected in an experiment is the information or measurements obtained during the study to analyze and draw conclusions.
A dependent variable is a variable dependent on the independent variable. A control variable is something you want to try to keep the same. A dependent variable is something you measure. An independent variable is something you change.