Independent variable - The factor being investigated: this factor is deliberately changed, also known as the ‘manipulated variable’, Dependent variable - The factor that changes in response to the independent variable, also known as the ‘responding variable’, Controlled variable - The factors that are kept the same for all tests and groups within the experiment, Experimental group - This group is being observed to see the effects of changing the independent variable, Control group - This group is used for comparison. It gives a base line or normal reading when no variable is change, Examples of experimental error - Limitations when reading scales, limited data to get reliable results, inability to control all variables, Hypothesis - Proposed relationship between the independent and dependent variable. Usually written as if (independent variable) increases/decreases then (dependent variable) increases/decreases. , Data - Information derived from an experiment, Repetition - Increases the reliability of an experiment, Accuracy - how correct or true the measurements are , Reliability - How similar your results are for trials of the same test  ,

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