Answer: The answer is the D. "Observation" is not a variable in an experiment.
Explanation: Research variables are factors that can be manipulated, measured or those that we try to explain through other variables. "Observation" is not a variable in an experiment, but it is the first step and fundamental part in the scientific method, in which the experiments are contained (experimentation stage). Observation is the information recorded during an experiment, obtained through the senses or through the registration of information on scientific instruments.
Observation is not a type of variable in a scientific experiment.
When performing an experiment, we can identify three kinds of variables:
A dependent variable is the one we will be focused on during the experiment, it is what we will be measuring. An independent variable is one that will not change in response to other variables in the experiment, it is not affected by the others and is often changed. Lastly, a control variable is any variable that we keep the same throughout the experiment. Since these are the only 3 variables in an experiment, we can say that only option D is correct, it is not a type of variable.
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