Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

u. 1. the premise or supposition that something is a fact, therefore, this is the act of taking something for granted. 2. one or several conditions that need to be met to justify use of a statistical procedure. For example, certain statistical techniques require that the samples size be over 30. Others requires independence of errors. If the assumptions are violated the results are invalid. See also robustness.

ASSUMPTION: "The person made the assumption that the lecture was in the same place it had been held for the past several weeks."

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