BPK 142 Lecture Notes - Lecture 6: Observational Error, Composition B, Measuring Instrument
11 Aug 2015
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The subject"s human rights are respected - informed consent form. The subject is given a thorough explanation of the purpose of the test, possible risks, benefits, etc: characteristics of a good physical fitnesstest. Measurement error makes the observed value of a measure differ from the true value: validity - a valid test is one that measures effectively what it is supposed to measure. A highly reliable test yields the same or approximately the same scores when administered twice to the same individuals, provided conditions and subjects are essentially the same. Error the deviation of a measurement, observation, or calculation from the truth. Random errors influence the results in a random (statistically unpredictable) manner. They cause the results to spread in both directions (positive and negative) about the true value. If a result is not repeatable --> random errors --> repeat the measurement several times and take the mean.
