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*** but due to the fact that the workers knew they were being observed | *** but due to the fact that the workers knew they were being observed | ||
*** which motivated them to work harder | *** which motivated them to work harder | ||
* Hawthorne effects may change observational data | |||
** called "clinical trial effect", in drug or medical testing, some patients may respond to the attention they receive from providers and not necessarily the drug or procedure being measured | |||
*** "placebo effects" are positive results in control patients (those who do not receive the drug or procedure) | |||
**** placebo effects are a "reactivity" phenomenon by which the patient changes attitude, behavior or undergo a subconscious reaction to a situation that changes the patient's outcomes | |||
* see also the Turing paradox by which the act of measurement changes the physical properties of what is being measured (applies to subatomic quantum systems) | |||
=== Illusion of truth paradox === | === Illusion of truth paradox === |