The experiment is ultimately testing a relationship between cause and effect: how changing X affects Y. The equipment must be suitable for carrying out the experiment and taking the necessary measurements. Several aspects of the experiment can contribute to validity: the equipment, the experimental method, and the analysis of the results.Īlthough it may seem obvious, the appropriate equipment needs to be used.
“Am I actually measuring what I’m trying to measure?”. “Does it test what it’s meant to test?” or. Validity relates to the experimental method and how appropriate it is in addressing the aim of the experiment: When writing the method of an experiment, you must ensure that each step of the method incorporates reliability, accuracy or validity. With the Matrix Practical Skills Workbook.Īn experiment is a set of measurements that are analysed to test a link or relationship between different things. The measurements are usually analysed in an experimental report, which is set out in a clear format to help the reader understand different aspects of the experiment, like the aim, the equipment and method used, the results obtained, how they were analysed, and what conclusions can be drawn. Draw appropriate graphs to convey relationships. Identify and apply appropriate mathematical formulae and concepts. Determine the sources of systematic and random errors. Assess the validity, reliability and accuracy of any measurements and calculations. Want to ace your next Physics Practical Assessment? Relationship between reliability and accuracy. So what do these terms mean and how do these things affect each other? One aspect of this is the reliability, validity, and accuracy of the experiment. 
Practical assessments are designed to test your practical skills: how well you can design and carry out an experiment and analyse results, but also your understanding of the purpose of the experiment and its limitations. Introduction to Validity, Reliability, and Accuracy of Experiments
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