STAT151 Chapter Notes - Chapter 3-4: Interquartile Range, Standard Deviation, Unimodality

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STAT151 Full Course Notes
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Graphs for numerical data variables often take many values we need to introduce other types of graphs to display the data for a quantitative variable in a fashion so that the distribution of the data becomes apparent. Describing a distribution of a plot: shapes, nature of distribution (unimodal, bimodal, multimodal) Modes - characterization of shapes through number of humps/little rectangles unimodal - single peak bimodal - two peaks : can occur when the data set consists of observation on two quite different kinds of individuals or objects. Multimodal - more than 2 peaks, although rare uniform - no peaks or modes. *very small dent in a peak does no necessarily mean bi- or multimodal e. g. this is a bimodal graph: symmetrical or skewed left/right. Symmetry - ability to draw a line so that there are 2 exact halves, creating a mirror image on both left and right sides.

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