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Reliability

Reliability Physics and Engineering McPherson chapter 5

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Chapter 5 Gaussian Statistics ? An Overview The Gaussian distribution (normal or bell-shaped distribution) is a widely used statistical distribution and it is generally used as the foundation for statistical qual- ity control. Simply measuring the time-zero values of a parameter (resistor values, mechanical tolerances, children heights, class grades on a test, etc.) can result in a distribution of values which can be described by a normal distribution. 5.1 Normal Distribution The normal distribution f(x) shown in Fig. 5.1 is defined by the equation: f (x) = 1 ? ? 2? exp { ? [ x ? x50 ? ? 2 ]2 } . (5.1) +??? x50 Parameter: x f(x) Histogram Parameter : x Fr eq ue nc y

Testing & Individual Differences

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Standardizations and Norms

Testing and Individual Differences Standardizations and Norms Standardized ? a test piloted on a sample population and norms of achievement have been established. People taking an experimental part of the SAT who represent a general group of SAT takers is the standardization sample. Questions everyone can answer and those almost no one can answer are discarded. Ideally, this allow for comparison between one person?s 1999 score and your score. Reliability and Validity Reliability is the consistency of the test. If you take it 3 times, all your scores should be similar. It is measured in the following ways: Split-half divides the test in two and correlates people?s scores Equivalent-form- correlation among different versions of the test
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