Objective: Although attention-deficit/hyperactivity disorder (ADHD) is frequently comorbid with Tourette's disorder (TD), it is unclear whether they have a common genetic etiology. Familial relationships between DSM-IVADHD and TD are studied in TD + ADHD, TD-only (TD-ADHD), ADHD-only (ADHD-TD), and control groups. Method: Case-control,…

Reports an error in "Does Barbie make girls want to be thin? The effect of experimental exposure to images of dolls on the body image of 5- to 8-year-old girls" by Helga Dittmar, Emma Halliwell and Suzanne Ive ("Developmental Psychology," 2006 Mar, Vol 42[2], 283-292). A substantive error occurs in the Body shape dissatisfaction section on page…

Counseling psychology is a relatively new field that is gaining autonomy and respect. Unfortunately, research efforts in the field may lack an appropriate research design. This paper considers some of the more common types of research design and the associated threats to their validity. An example of each design type is drawn from the counseling…

Since 1988 five evaluations of Federal demonstration programs in education have been implemented that had random-assignment designs to measure program impacts. The implementation of two of these evaluations, the evaluation of the School Dropout Demonstration Assistance Program and that of the Alternative Schools Random Assignment Program, are…

When the Trust Territory of the Pacific Islands gradually dissolved in the 1980s, the Republic of Palau assumed a greater responsibility for its own education system. In order to monitor the mathematical achievement of elementary school students during the transition from external to local control of educational procedures, basic skills…

Parametric analysis of covariance was compared to analysis of covariance with data transformed using ranks. Using a computer simulation approach the two strategies were compared in terms of the proportion of Type I errors made and statistical power when the conditional distribution of errors were: (1) normal and homoscedastic, (2) normal and…

Adult leaders from 14 counties, divided into matched participating (57) and control (54) groups, were surveyed to evaluate whether Cooperative Extension Service programs on land use planning in Arkansas resulted in increased knowledge and more favorable attitudes toward such planning. Participants filled out attitudinal questionnaires before…

In September 1978, the Lenoir City (Tennessee) school system initiated in two elementary schools a volunteer tutoring program called the Retirement Power in Education Project (RPIE). Fourteen volunteers, including twelve retirees, were trained to use Laubach reading materials in tutoring fourth and seventh graders. In evaluating the project one…

THIS PROJECT TESTED WHETHER THE TELE-LECTURE AND ELECTROWRITER COULD (1) BE USED EFFECTIVELY FOR THE SIMULTANEOUS INSTRUCTION OF ADULTS IN MULTIPLE REMOTE AREAS, AND (2) USED BY A MASTER TEACHER TO PROVIDE LEARNING EXPERIENCE FOR ADULTS WHICH IS AT LEAST AS EFFECTIVE AS FACE-TO-FACE INSTRUCTION. UTILIZING AMPLIFICATION AND MICROPHONE TRANSMISSION…

This study compared teacher demonstrations with a slide-tape methods of presenting demonstrations in graphic arts. It involved 134 eighth grade students and four teachers in four schools. Random assignment to treatments was made by classes. Four demonstrations randomly selected from a group were (1) composing a line of type, (2) locking-up a type…

An experiment was conducted to determine whether special reading instruction integrated with agricultural instruction would result in improved reading ability and increased achievement in subject matter. random assignment was made of vocational agriculture classes in 12 Maryland schools to experimental and control groups. Units on soil sampling…

This study, conducted over a period of three weeks at the University of Kansas, attempted to determine whether knowledge of musical structure would effect greater understanding and, eventually, enjoyment of music. Experimental and control groups comprising freshmen who were not enrolled in a music course listened repeatedly to excerpts of…

The aims of this study were to: (1) investigate the effectiveness of teaching machines in teaching vocabulary, (2) examine the relationships between various anxiety levels and the effectiveness of the teaching machine and the relationships between extroversion and introversion and the effectiveness of the machine, and (3) examine the possible…

This study assessed the effectiveness of five hours of distributed training on three-year-old children's comprehension and production of the passive, negative, possessive and negative passive syntactic structures. A comprehension test identified 20 children who did not evidence understanding of these structures. Subject were randomly assigned to…