الفهرس 
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Abstract
Reliability theory is a body of ideas, mathematical models, and methods directed to predict, estimate understand, optimize the life span and failure distributions of systems and their components (Barlow and proschan, 1975).
Traditionally, problems of statistical inference are divided into problems of estimation and tests of hypotheses.
The main difference between the two kinds of problems is that in problems of estimation, the value of a parameter must be determined (or the values of several parameters) from a possible continuum of alternative, whereas in tests of hypotheses.