To study the relationship of education to economic growth for the state of Iowa, the hypothesis that increasing the level of education for the labor force would lead to higher levels of income or economic growth was tested for the period from 1950-1967. The Cobb-Douglas production was used to evaluate the relationship. The function used labor…

A comparison was made of short- and long-term visual and auditory memory in relation to visual and auditory interference. The questions investigated were: (1) will interference be greater when it occurs in the same modality (auditory or visual) in which it was learned (i.e., similarity hypothesis), or (2) will interference be greater when it…

An equation was derived to determine the relationship between the pooled within-subgroup r (correlation coefficient) and the r obtained from the total group data. It was, thus, possible to assess the amount of distortion introduced by pooling heterogeneous subgroups. As a basis for deciding whether to pool two subgroups in order to calculate a…

One aspect of reference group theory, racial identification, was studied, and the effects of this identification on the acquisition of knowledge and the formation of attitudes were examined. Three hypotheses were investigated: (1) Children who perceive an instructional tape narrator to be a member of their own race will score significantly higher…

A set of mathematical consistencies that forms conditions of inequality in a theorem is summarized, and a strategy for its application with real data is presented. The theorem and strategy are suggested for immediate use by the practitioner seeking cause-effect relationships in a system of variables to cut down guess work and time in analysis and…

A computer-based learning simulation was developed at Florida State University which allows for high interactive responding via a time-sharing terminal for the purpose of demonstrating descriptive and inferential statistics. The statistical simulation (STATSIM) is comprised of four modules--chi square, t, z, and F distribution--and elucidates the…

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)