2.2 More Graphs and Displays

I. Graphing Quantitative Data Sets Stem and Leaf Plots: Stem – left most digit Leaf – right most digit(s) - Similar to a histogram but still contains original data. - Easy way to sort data. - Stems must be in numerical order with no skipped numbers. Leaves must also be in numerical order. Page 49 – 50 Examples 1 & 2

I. Graphing Quantitative Data Sets Dot Plot: Each data entry is plotted using a point above a horizontal axis. - Allows you to: 1) see how data are distributed 2) determine specific entries 3) identify unusual data values Page 51 Example 3

Now back to pg45 #23… Make a stem and leaf…. Make a dot plot….

II. Graphing Qualitative Data Sets Pareto Chart: Vertical bar graph with bars in decreasing order which helps highlight important data (used frequently in business) - Bars must touch! Page 53 Example 5 and Try It Yourself 5

Practice Classwork: Page 56 #3 – 10 all Homework: Page 57 – 58 #16, 19, 22

II. Graphing Qualitative Data Sets Pie Chart: A circle that is divided (proportional to frequency) into sectors that represent categories - Multiply relative frequency by 360° to create sectors with a protractor - Label sectors with percentages by changing relative frequency decimals to percents Page 52 Example 4 and Try It Yourself 4

III. Graphing Paired Data Sets when each entry in one data set corresponds to one entry in a second data set (x, y) Scatter Plot: Ordered pairs are graphed as points in a coordinate plane. Used to show the relationship between two quantitative variables. Page 54 Example 6 & Try It Yourself 6

III. Graphing Paired Data Sets Time Series Chart: A graph that displays a data set composed of quantitative entries taken at regular intervals over a period of time. Page 55 Example 7 & Try It Yourself 7

Practice  Classwork : Page 57 #11 – 14 Homework: Page 58 – 59 # 20, 24, 26