1. DAP 1- Read, create, & interpret graphs when appropriate DAP 3- Analyze a set of data by using & comparing combinations of measures of central tendancy Pages 64-67 2-3 Line Plots

2. Benefits of Using Line Plots: Line Plots can be used to show how data is spread out. A line plot provides an easy way to organize data. A line plot shows the frequency of data on a number line. One type of graph is a line plot. They are usually used when there is one group of data, and fewer than 50 values.

3. Parts of a Line Plot A horizontal number line An “X” is placed above a number on the # line each time that the value occurs The number of “X's” above each value indicates how many times (the frequency) each value occurred

4. Make a Line Plot Suppose thirty people live in an apartment building. They are the following ages: Ages of People Living in the apartment building 58 30 37 36 34 49 35 40 47 47 39 54 47 48 54 50 35 40 38 47 48 34 40 46 49 47 35 48 47 46 Step 1: place the values in order from least to greatest 30, 34, 34, 35, 35, 35, 36, 37, 38, 39, 40, 40, 40, 46, 46, 47, 47, 47, 47, 47, 47, 48, 48, 48, 49, 49, 50, 54, 54, 58 Step 2: create your graph

5. This graph shows all the ages of the people who live in the apartment building. How old is the youngest person in the apartment building? 30 How old is the oldest person? 58 What is the most common age of the residents in the building? 47

6. Line plots allow several features of the data to become more obvious. For example, outliers, clusters, and gaps are apparent. Outliers are data points whose values are significantly larger or smaller than other values, such as the ages of Clusters are isolated groups of points, such as the ages of Gaps are large spaces between points, such as The range of the data is the difference between the greatest and least numbers in the data set, such as 30, and 58. 46 through 50. 41 and 45. 58-30= 28.

7. You Try… The table at the right shows the ages of the U.S. Presidents at the time of their inaugurations. Make a line plot of the data. What is the youngest entry on the data table? What is the eldest entry on the data table? Let’s start at 40 and finish at 75. Age at Inauguration 57 51 54 56 61 61 49 49 55 52 57 64 50 51 69 57 50 47 54 64 58 48 55 51 46 57 65 55 60 54 6152 54 62 68 54 56 42 43 46 51 55 56 4060555045706575 Identify any clusters, gaps and outliers that exist. What is the range of the given data?