The relative power of the Mann-Whitney statistic, the t-statistic, the median test, a test based on exceedances (A,B), and two special cases of (A,B) the Tukey quick test and the revised Tukey quick test, was investigated via a Monte Carlo experiment. These procedures were compared across four population probability models: uniform, beta, normal,…

The purpose of this study was to investigate the relationship between performance on Piagetian conservation tasks and the ability to form hypotheses as to the probable content of story material among first and second grade children. Cognitive operations selected for comparison were operations concerning conservation of mass, conservation of…

This note shows that, under conditions specified by Levin and Subkoviak (TM 503 420), it is not necessary to specify the reliabilities of observed scores when comparing completely randomized designs with randomized block designs. Certain errors in their illustrative example are also discussed. (Author/CTM)

Comments (TM 503 706) on an earlier article (TM 503 420) concerning the comparison of the completely randomized design and the randomized block design are acknowledged and appreciated. In addition, potentially misleading notions arising from these comments are addressed and clarified. (See also TM 503 708). (Author/CTM)

This note continues the discussion of earlier articles (TM 503 420, TM 503 706, and TM 503 707), comparing the completely randomized design with the randomized block design. (CTM)

The latency to classify a test item as not being from a memorized list of category words is usually slower when the test items are categorically related to memorized words than when they are unrelated. This observation has been explained by four models of recognition, which are evaluated here. (Editor/RK)

The controversy surrounding regression methods for unbalanced factorial designs is addressed. The statistical hypotheses being tested under the various methods, as well as salient issues in the use of these methods, are discussed. The use of statistical computer packages is also discussed. (Author/JKS)

Voluntary forgetting of a list of verbal items was tested under two conditions. Results show that both recall and recognition increase as a function of the spacing between the two occurrences under the Remember-Forget condition, but not under the Forget Forget-Remember condition. (Editor/RK)

The major focus of the three studies reported was the consequences of changing public conceptions of mental illness for the sufferer and his family. In two identically performed studies, two messages (one describing mental illness as a disease and the other as a product of social learning) were effective in changing beliefs. (Editor/RK)

Hypothesizing that prejudiced feelings about minorities are due not only to racial differences but to the fact that minorities often have lower socio-economic rank as well, this study examines data from a household survey in Tulsa, Oklahoma and documents the greater salience of socioeconomic cues and the lesser salience of racial cues for social…

Four experiments were carried out in which "subliminal psychodynamic activation" effects, used for studying the relationship between psychopathology and unconscious conflict, were sought out from male college students. Results were discussed for their bearing on subliminal research and research in personality. (Editor/RK)

Research on laterality and intellectual abilities suggests that left-handed persons may be divided into two categories: one not discriminably different from those who are right-handed, and one deficient in intellectual and cognitive abilities. 7688 children were tested on handedness, intellectual performance, and scholastic aptitude in order to…

The problems of two way analysis of variance designs with unequal and disproportionate cell sizes are discussed. A variety of solutions are discussed and a new solution is presented. (JKS)

This study was undertaken to extend the learned helplessness phenomenon to a clinical population and to test the competing hypotheses of Seligman and Lewinsohn. 96 male hospitalized psychiatric and medical patients were randomly assigned to one of four experimental conditions. Results replicate the learned helplessness phenomenon in a group of…

Two weeks of twice-daily practice of the Transcendental Meditation (TM) technique was compared with 2 weeks of twice-daily practice of passive relaxation as a means of reduction of anxiety, as measured by the Trait scale of the State-Trait Anxiety Inventory. (Editor)