The Dunnett procedure for comparing several treatment means with a control is applied to the problem of comparing several treatment variances with the variance of a control. Appropriate critical values are specified and an example is provided. (Author)

A solution is proposed for analysis of variance procedures with missing cells, such as may occur when a control group is not assigned to any of the rows or columns of the various experimental groups. Mathematical models for two-way design are presented which define several variables; as well as row effect, column effect, and row and column…

This study investigates the possibility that the reinforcement strength of stimuli can be enhanced by observational learning as well as by pairing with unconditioned reinforcers. The reinforcement strengths of two candies were determined for 40 preschool children as measured by rate of response on a button pressing apparatus. The children then…

Using the Component Display Theory as an analyzing tool, this study compared the effects of expository and discovery methods of instruction on two learning outcomes, application and transfer. One hundred ninth grade students in each of four earth science classes were randomly assigned to five groups--four experimental groups designed to test four…

A study to investigate the effect of training in listening to speeded discourse on listening comprehension was conducted. Specifically, the study was designed to test the following hypothesis: There is no signifant difference in the amount of gain in listening achievement of the sixth-grade pupils who received speeded discourse speech training…

One of the important components of the elaboration theory (Reigeluth, 1979) is the synthesizer, which provides information to relate and integrate a set of concepts and which can appear in different formats. This study investigated the effectiveness of three formats of post-instruction synthesizer on student recall of definitions of concepts and…