Definition of validity, reliability, and accuracy for science. Damn, my teacher gave us a sheet of definitions for these but I chucked all my HSC sheets out a few days back. I never completely understood them myself, but the general consensus from all my classes was: Validity: the experiment correctly tests the aim - i. If in biology, for example, you were testing say the level of enzyme activity with respect to changes in temperature, you obviously wouldn't do one experiment at 3. H 8; you'd keep everything except temperature constant. Reliability: how consistent the results are. When you repeat an experiment and get the same results, it is reliable.
Provides an easily understandable introduction to genetics and pharmacogenomics, the study of how different drugs interact with multiple genes and the biological. Help us Improve Lab Tests Online-AU Please take a few minutes to complete this survey. Your feedback is important in helping us make decisions about how best to. Accuracy: the easiest one, simply how accurate it is. Measuring with a stopwatch that calculates milliseconds is obviously more accurate than one that only calculates up to seconds. A data logger is obviously more accurate than the naked eye. A funny example my teacher told us was this: a scientist set out to prove that cockroaches listened through their legs. He ripped of a cockroach's legs, set it on a table and clapped loudly over it. It didn't move. He did it again; ripped off the legs, clapped, and it didn't move. See," the scientist said. Without its legs, the cockroach can't hear the clap and doesn't move." My teacher said this experiment was reliable because you got the same results every time, but invalid because obviously, the poor roach needs legs to run away. Again, not completely sure that my definitions are right. Reliability and accuracy I'm fairly confident about; validity was the one I was always iffy with. I suggest checking with a couple of teachers and classmates to be on the safe side. In school assessments, it'd be safest to go by what your teacher tells you.
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