Observation is not a type of variable in a scientific experiment; option D
Variables are those factors which affect the results of an observation or test in a scientific experiment.
The changes that occur in variables are controlled by the experimenter in order to bring about changes in the observations or the result of the experiment.
The following are the types of variables in a scientific experiment:
The dependent variable changes when the independent variable is altered. The constant variable is not altered in an experiment but is kept constant.
In conclusion, variables are factors whose changes bring about changes in the results of an experiment.
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Note that the complete question is found below:
Which of the following is not a type of variable in a scientific experiment? A. Independent B. Control C. Dependent D. Observation
