Abstract

Statistical graphs are the usual form of visual communication. In the utilization of statistical graphs the emphasis is focused either on the presentation of data or their analysis. The primary function of graphs was the visual presentation of data. But, with the development and application of electronic computers and software the analytical function of graphs has an increasing importance (Schmid, 1983). Today’s graphical techniques allow comparisons between groups of data. Box-and-whisker plot is a simple graphical method that is introduced to students in teaching descriptive statistics as a useful exploratory data analysis tool for studying main characteristics of distribution, detecting outliers and extreme values. This paper deals with application of this diagram and its categorized form (trellis diagram) in analysis and modelling data from designed experiments in agriculture.

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