A process or study that results in the collection of data, the outcome of which is unknown.

Most experiments involve carefully changing one variable and observing the effect on another variable.

Controlled Experiment

An experiment that uses the method of comparison to evaluate the effect of a treatment by comparing treated subjects with a control group, who do not receive the treatment.

Double Blind Experiment

Neither the subjects nor the people evaluating the subjects knows who is in the treatment group and who is in the control group.

Random Experiment

An experiment or trial whose outcome is not perfectly predictable, but for which the long-run relative frequency of outcomes of different types in repeated trials is predictable.

Randomised Controlled Experiment

A controlled experiment in which the assignment of subjects to the treatment group or control group is done at random.

Uncontrolled Experiment

An experiment in which there is no control group.

See also: Blind Experiment, Controlled Experiment, Double Blind Experiment, Hypothesis, Null Experiment, Random Experiment, Randomised Controlled Experiment, Theory, Uncontrolled Experiment.

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Subjects: General

Practical Physics Experiments can sharpen students powers of observation, stimulate questions, and help develop new understanding and vocabulary.
Practical Chemistry This website provides all teachers of chemistry with a wide range of experiments to illustrate concepts or processes, as starting-points for investigations and for enhancement activities such as club or open day events.