Validity

Validity:

o   The extant to which an instrument measures what it is suppost to measure

i.e: Does your measuring tape accurately measure iq.

Initial validity:

You’ve done everything correctly inside the lab. Are the results truly from the variable that you’ve changed in your experiment

Context validity:

o   When examining the testing instrument

o   i.e: questionnaire it appears to be measuring what its suppose to measure

·      The test was poor

Construct validity:

o   Does the test support the theory that is being tested

·      This is positive

External validity:

o   Your test set conditions that people would come across in real life. How comparable are the results from this test to the results from a parallel test?

Internal validity:

o   Lets say I study sleep deprivation I ask group 1 to sleep 4 hours the other 8 hours

·      The initial vitality is poor