This article proposes 2 new approaches to test a nonzero population correlation ([rho]): the hypothesis-imposed univariate sampling bootstrap (HI) and the observed-imposed univariate sampling bootstrap (OI). The authors simulated correlated populations with various combinations of normal and skewed variates. With [alpha[subscript "set"]]=0.05, N…

Adjustment methods such as propensity scores and analysis of covariance are often used for estimating treatment effects in nonexperimental data. Shadish, Clark, and Steiner used a within-study comparison to test how well these adjustments work in practice. They randomly assigned participating students to a randomized or nonrandomized experiment.…

A formula for determining sample size, which originally appeared in 1960, has lacked a table for easy reference. This article supplies a graph of the function and a table of values which permits easy determination of the size of sample needed to be representative of a given population. (DG)

The U.S. Army Research Institute for the Behavioral and Social Sciences has developed a wide range of statistical models to test hypotheses generated in relation to an equally wide range of measurement and evaluation situations. The randomized block (RB) design has traditionally been a preferred model for much psychological research. The RB has…

Discusses the idea that with larger cohorts of the very old, subjects in their 80s and 90s will be increasingly sought as respondents. Points out various steps that need to be taken to assure that this older group will be represented by the ailing as well as the healthy community residents. (Author/EJT)

Examines assumptions underlying the employment of group means in communication research. Suggests a sample mean cannot be assumed to be a "good" statistic when the response vector represents different individuals' outcomes versus different outcomes of an individual. Notes implications for communication research. (SR)

This is one of a series of eight short monographs intended to aid practicing educators in planning and conducting accountability programs in schools. This booklet discusses how to determine a sampling method that is appropriate to the objectives of a particular research or evaluation effort. Short sections focus in turn on why and when to sample,…

This study developed and investigated an empirical sampling distribution of the congruence coefficient. The effects of sample size, number of variables, and population value of the congruence coefficient on the sampling distribution of the congruence coefficient were examined. Sample data were generated on the basis of the common factor model and…

This report describes a statistically designed experiment that was carried out in an operational setting to determine the contributions of different sources of variation to the unreliability of scoring. The experiment made novel use of partially balanced incomplete block designs that facilitated the unbiased estimation of certain main effects…

This report presents the results of a two-year project to design, pretest, and revise the Statistical Survey of Elementary Schools, which is intended to provide information on federally funded elementary education programs operating in local public school systems. The report also documents the activities and decisions that brought about these…

A self-instructional book covers ten steps toward development of a behavior observation system. Units describe how to interpret graphs, convert information from table to graph form, put collected data into a table, compute the reliability of observational data, make observations with four recording methods, construct an observational system,…

The Colorado Council for Library Development commissioned a state survey to facilitate long range library planning. A survey was designed by Colorado Market Research Services, Inc. and directed to adults throughout the state to ascertain the information needs of the sample population. Citizens were queried as to the frequency of their library use,…

This manual describes a comprehensive system of procedures or a model constructed for the purpose of improving occupational student follow-up in California community colleges. The manual deals with such pragmatic research considerations as conceptualization of research design, sampling, questionnaire content, suggestions for data processing, and…

The purpose of this study was to empirically determine the effects of quantified violations of the underlying assumptions of parametric statistical tests commonly used in educational research, namely the correlation coefficient (r) and the t test. The effects of heterogeneity of variance, nonnormality, and nonlinear transformations of scales were…

This paper outlines procedures used to derive variables from data in the National Survey of Postsecondary Faculty; these variables were then used to create measures not expressly included as items in that survey. The derived variables were used to examine faculty satisfaction in two contexts: first, the complexity of satisfaction, and second, the…