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Measurement validity and measurement sensitivity mean the same thing
You hang a 10kg weight from a strain gauge, this produces a reading of 9.91kg. You repeat the test in exactly the same way and this time the reading is 9.98kg. The 0.07kg difference between the two readings is an example of
A coefficient of variation of 10% associated with a test means that an individual’s score recorded is accurate to within plus or minus 10%
The mean score two or more trials will likely represent a more accurate assessment of an individual’s true performance compared to the result of a single trial.
Assessment of the individual requires a greater level of measurement precision than assessment of group responses