By design, randomized experiments (XPs) rule out bias from confounded selection of participants into conditions. Quasi-experiments (QEs) are often considered second-best because they do not share this benefit. However, when results from XPs are used to generalize causal impacts, the benefit from unconfounded selection into conditions may be offset…

Outlines the purposes of statistical analysis and types of research questions that can be answered. Defines data types as a guide for choosing statistical tools. Describes a hypothetical research study on teaching computer software to illustrate the use of analytical tools. (SK)

During the 60's, systems for the observation of classroom behavior have become an important area of educational research. Many new systems have been devised both for the evaluation of teaching techniques and for basic research into teaching processes. In the development of such systems the investigator must determine what behaviors are to be…