In class we did an exercise where I was an observer in the activity. I recorded the hand movements and gesture made by the people being observed and i found out that the gestured were changing through the activity as the people being observed were to busy figuring out what we were doing and that changed their movements. Because of this change in normal movements the data was false as the act of humans being intuitive made them wonder what we were doing and figure out what we were doing. After they found out what we were doing they changed their behaviour.
So for true results the people being observed must not see or know about the test so the actions of the people being observed would not change for the results.
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