Chapter 5 Displaying and Describing Quantitative Data.pdf -...

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5.1 - Displaying Quantitative Variables Histograms Counts the number of cases that fall into each bin, and displays that count as the height of the corresponding bar No gaps in a histogram Gaps indicate a region where there are no values § Relative Frequency Histogram - y-axis becomes the percent of the total amount instead of a strict number Faithful to the area of principle Shape stays exactly the same Stem and Leaf Displays Gives individuals as well as graphs Data on the left side of the line is the stem - the first digit of the two-digit number Data on the right side of the line the leaf - the second digit of the two-digit number Quantitative Data condition - The data are values of a quantitative variable whose units are known 5.2 - Shape Pay attention to a graph's shape, center, and spread Mode - single, most frequent value A histogram with one main hump is unimodal A histogram with two main humps is bimodal A histogram with three or more humps is multimodal

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