![]() ![]() Information obtained should be consistent with information from other reputable sources.Įxperiments should test the hypothesis that is proposed.The experimental method must be correct?All variables should be identified and controlled. Instruments should be precise and calibrated.Īll tests should be repeated a significant number of times. This may be done by making comparisons or conducting further experiments. In determining validity, students should consider the degree to which evidence supports the assertion or claim being evaluated. In a valid experiment all variables are kept constant apart from those being investigated, all systematic errors have been eliminated and random errors have been reduced by taking multiple measurements. ![]() A procedure is invalid if the method of the experiment is incorrect or partially incorrect. Consistency is usually achieved by repetition.Ī procedure is valid if it tests what it is supposed to be testing. Reliability refers to the consistency with which we can confirm a result. We can measure a small distance with a metre rule or with much greater accuracy using a micrometer. Accuracy refers to the exactness of a measurement. Most measurements contain some uncertainty.
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