# Post-Lecture1-3

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Lecture 1.3 Describing Data (continued...)
Visualising quantitative data (Boxplot) The boxplot (or box-and-whiskers plot) is a graphical representation of the five-number summary. Because the whiskers must end at an observed data point, the whisker lengths can look unequal, even though 1.5 IQR is the same for both sides. Observed data points outside the boundary of the whiskers are plotted as outliers and are flagged as unusual. Probability Models and Data Analysis (STAT2203/7203 Semester 2, 2022) - Lecture 1.3 2/14
Visualising quantitative data (Histogram) A histogram is a common graphical representation of the distribution of a quantitative variable. First, the range of the data is divided into a number of bins . We then tally how many values fall in each bin and then make the plot by drawing rectangles whose bases are the bin intervals and whose heights are the counts. Histograms can be sensitive to the choice of the number of bins. Probability Models and Data Analysis (STAT2203/7203 Semester 2, 2022) - Lecture 1.3 3/14