MATH 140 Lecture Notes - Lecture 2: Multimodal Distribution, Unimodality
Document Summary
2. 1 2. 2 visualizing numerical distributions: shape, center, and variability. Symmetrical- evenly distributed on both sides of the graph, easier to find the center of the graph. Variability- how far values usually are from the center of the graph. Relative frequency- another term that is used for proportion. Each dot on a dot plot stand for one unit in the sample. Range: maximum number subtracted by the minimum number: not at all useful for telling how variable the graph is. Bimodal distribution: there are 2 peaks within the graph: usually occurs when the graph comes from more than one population. Outlier: a value of data that is considered strange because it stands far from where the bulk of the data are on the graph. Dot plots use dots to mark values from the statistics. Histograms instead use bars that tell you the frequency that the studied variable occurs.
