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in biology Validity refers to what

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in biology validity refers to a test measures what it purports to measure.

  • First, we have to  establish the validity of a test score when used for a particular purpose, so that  a score may be improperly used for one purpose, but not for another
  • Second, validity is a matter of degree so that we  know if validity is sufficient to make use of the test worthwhile
  • Third, we must distinguish between validity n accuracy of norms of a test so that we know if  It's possible for a test to have a good validity but have norms that is off the mark. The converse may be also true.
  • Validity is the main extent to which a concept, conclusion or measurement is well-founded and likely corresponds accurately to the real world. The word "legitimate" is derived from the Latin validus, meaning robust. The validity of a size device is the diploma to which the tool measures what it claims to measure.

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