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Chapter 2: Frequency Distributions and Graphs (or making ...

Chapter 2: Frequency Distributions and Graphs (or making pretty tables and pretty pictures). Example: Titanic passenger data is available for 1310. individuals for 14 variables, though not all variables are recorded for all individuals. Consider the following variables: Survival, Sex, Number of relatives on board, Age Who wants to stare at a big dataset? If you have 1310 people measured for 14 variables, how much information are we going to get by looking at the data set? See for yourself: That's where tables that summarize the data and Graphs of these summaries come in handy! Ch2: Frequency Distributions and Graphs Santorico -Page 26. Section 2-1 Organizing Data Data must be organized in a meaningful way so that we can use it effectively. This is often a pre-cursor to creating a graph. Frequency distribution the organization of raw data in table form, using classes and frequencies. Class a quantitative or qualitative category. A class may be a range of numerical values (that acts like a category ) or an actual category.

Frequency Polygon – a graph that displays the data by using lines that connect points plotted for the frequencies at the midpoints of the classes. The frequencies are represented by the heights of the points. Steps: 1. Find the midpoint of each class (by averaging the class boundaries). 2. Draw the x and y axes.

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