2. How to talk about a set of numbers? 1. Put them in order 2. Graph them Rules Label axes Divide up the axes evenly

3. When? What? Histogram Bar Chart Stacked Bar Chart Line Chart Pie Chart

4. Histogram vs Bar Chart HISTOGRAM BAR CHART The bars must touch Data is grouped Ex: Comparing numbers of companies that earn $0- 20,000, $20,000-$40,000, $40,000-$60,000 The bar doesn’t have to touch Data isn’t grouped Ex: Comparing total revenue of different companies

5. Histogram Mass of Fishes (kg): 1011.411.81212.512.713.113.513.8 13.9141414.314.614.814.814.915 15.215.3 15.715.815.91616.216.917.1 17.417.9

6. Histogram

7. Bar Chart Fish A : 5kg Fish B : 4kg Fish C : 7kg Fish D : 10kg Fish E : 8kg

8. Segmented Bar Chart LaptopPrinterInk 200760%25%15% 200850%15%35% 200940%10%50% Breakdown of HP Revenue in 2007 - 2009

9. Segmented Bar Chart Percentage Year

10. Pie Chart Showing proportion of parts to a whole Radii from the center Make the biggest part appears first, start at 12 o’clock and clockwise Several small segments grouped into one category Differentiate wedge with colors Keep labels horizontal

11. Line Chart Illustrate changes over time Vertical axes (y-axes) : Dependent Variable Horizontal axes (x-axes) : Independent Variable Multiple Line chart: compare

12. Line Chart Year