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Analysis Premilinary Exam September 2009 1. Let X be a non
Analysis Premilinary Exam September 2009 1. Let X be a non

... 3. A function f : R → R is called Lipschitz if there exists a constant C > 0 such that, for every x, y ∈ R, |f (x) − f (y)| ≤ C|x − y|. (a) Prove that every Lipschitz function is absolutely continuous. (b) Give an example of an absolutely continuous function that is not Lipschitz. 4. Let (X, M, µ) b ...
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... group. If n1 = n2, then the test statistic, WS, is the smaller of the two sums of ranks. Go to the table (starts on page 689 of the 6th edition of Howell) and obtain the one-tailed (lower tailed) p. For a two-tailed test (nondirectional hypotheses), double the p. If n1  n2, obtain both WS and WS ...
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Psychometrics

Psychometrics is a field of study concerned with the theory and technique of psychological measurement. One part of the field is concerned with the objective measurement of skills and knowledge, abilities, attitudes, personality traits, and educational achievement. For example, some psychometric researchers have, thus far, concerned themselves with the construction and validation of assessment instruments such as questionnaires, tests, raters' judgments, and personality tests. Another part of the field is concerned with statistical research bearing on measurement theory (e.g., item response theory; intraclass correlation).As a result of these focuses, psychometric research involves two major tasks: (i) the construction of instruments; and (ii) the development of procedures for measurement. Practitioners are described as psychometricians. All psychometricians usually possess a specific qualification, and while most are psychologists with advanced graduate training, many work for the government or in human resources departments. Others specialize as learning and development professionals.
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