Considered the statistical comparison of groups under the condition of equal sample sizes. (Author)

The efficacy of behavioral objectives in improving student achievement was assessed in a college setting. (Editor)

The present authors argued that the covariance analysis is completely valid even if there is a true main effect for pretesting and a second point of the paper involved a recommendation for data analysis if the interaction from ANOVA was significant. (Editor/RK)

This article has been written to point out why the analysis of covariance is a useful technique even when there is no difference between the groups being compared in terms of mean scores on the concomitant variable. (Author)

This poem, with stanzas in limerick form, refers humorously to the many threats to validity posed by problems in research design, including problems of sample selection, data collection, and data analysis. (SLD)