Is the ‘dropping a ruler’ experiment a valid measure of reaction time? AccuracyĪccuracy describes how well a measuring instrument determines the variable it is measuring. Does seeing how far a ruler can drop through someone’s hand really measure reaction time? What other variables may be influencing the results? Validity describes whether the results of an experiment really do measure the concept being tested. Is the ‘dropping a ruler’ experiment a reliable measure of reaction time? Validity Do this ten times and calculate the mean (average) result. Note down the measurement where the ruler was caught. Try holding a ruler above a friend’s open hand and dropping it – they have to catch the ruler but may not move until they see the ruler start to move.
Reliability is measured by a percentage – if you get exactly the same results every time then they are 100% reliable. When a scientist repeats an experiment with a different group of people or a different batch of the same chemicals and gets very similar results then those results are said to be reliable. Being Reliable, Accurate & Valid Reliability
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