MGNT notes 9 - MGNT Standard error of measurement Since...

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MGNT Standard error of measurement: Since only one score is obtained from an applicant, the critical issue is how accurate the score is as an indicator of an applicant’s true level of knowledge. The standard error of measurement (SEM) addresses this issue. It provides a way to state, within limits, a person’s likely score on a measure. When SEM is known, the range within which any individual’s true score is likely to fall can be estimated. That range is known as a confidence interval or limit. There is a 95% chance that a person’s true score lies within ±2SEM of his or her actual score. In short, there is not a one-to-one correspondence between actual scores and true scores. Most measures used in staffing are sufficiently unreliable, meaning that small differences in scores are probably due to error of measurement and should be ignored. Validity: the validity of a measure is defined as the degree to which it measures the attribute it is supposed to be measuring. E.g., the validity of the test of
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