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Full-Text Articles in Education

Retesting In Selection: A Meta-Analysis Of Practice Effects For Tests Of Cognitive Ability, John P. Hausknecht, Jane A. Halpert, Nicole T. Di Paolo, Meghan O. Moriarty Gerrard Jul 2010

Retesting In Selection: A Meta-Analysis Of Practice Effects For Tests Of Cognitive Ability, John P. Hausknecht, Jane A. Halpert, Nicole T. Di Paolo, Meghan O. Moriarty Gerrard

John Hausknecht

Previous studies indicate that as many as 25-50% of applicants in organizational and educational settings are retested with measures of cognitive ability. Researchers have shown that practice effects are found across measurement occasions such that scores improve when these applicants retest. This study uses meta-analysis to summarize the results of 50 studies of practice effects for tests of cognitive ability. Results from 107 samples and 134,436 participants revealed an adjusted overall effect size of .26. Moderator analyses indicated that effects were larger when practice was accompanied by test coaching, and when identical forms were used. Additional research is needed to …


Mercury And Autism: A Review, Jie Zhang, John J. Wheeler Dec 2009

Mercury And Autism: A Review, Jie Zhang, John J. Wheeler

John J. Wheeler

Abstract: The prevalence of autism has increased approximately four times in children in nearly one decade (California Health and Human Services Agency, 2003). It has been reported that explanations such as immigration, shifts in the interpretation of diagnostic criteria, improved identification, or diagnostic accuracies cannot explain the observed increase (Geier & Geier, 2005). One potential cause that has alarmed many has been the presence of thimersol, the mercury-based preservative found among immunizations. Although many refute this, concern has been leveled by many families and professionals concerning the potential impact of mercury poisoning as a causal factor. Researchers have proposed that …