Chapter 15 : Communicating Evidence Visually

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Presentation transcript:

Chapter 15 : Communicating Evidence Visually Masoomah Al Zaher - Afaf AlThinayyan Ghada Tamimi – Fatimah AlGhamdy

15.1 Choosing Visual Or Verbal Representations When the data are few and simple, readers can grasp them as easily in a sentence as in a table for example : In 1996, on average , men earned $ 32,144 a year, women $ 23,710 , a difference of $ 8.434. Male-female salaries ($), 1996   32,144 Men 23,710 Women 8,434 Difference

But if you present more than a few numbers, readers will struggle to keep them straight such as; Between 1970 and 2000, the structure of families changed in two ways. In 1970, 85 percent of families had two parents, but in 1980 the number declined to 77 percent, then to 73 percent in 1990, and to 68 percent in 2000. The number of one-parent families rose, particularly families headed by a mother. In 1970, 11 percent of families were headed by a single mother. In 1980 that number rose to 18 percent, in 1990 22 percent, and to 23 in 2000. There were some marginal changes among single fathers (headed 1 percent of the families in 1970, 2 percent in 1980, and 4 percent in 2000). Families headed by no adult remained stable 3-4 percent.

Chart

Line Graph

15.2 Choosing the most effective graphic A table seems precise and objective. It emphasizes discrete number and requires readers to infer relationship or trends on their own (unless you state them in an introductory sentence). 2000 1990 1980 1970 Family type 68 73 77 85 2 parents 23 22 18 11 Mother 4 3 2 1 Father No adult

15.3 Designing table, charts, and graphs Tables with lots of data can see, dense. Order the rows and columns by a principle that lets readers quickly find what you want them to see. Round numbers to a relevant value. Sum totals at the bottom of a column or at the end of row, not at the top or left.

Table 15.5: 1990 2001 Change Australia Canada France Germany Italy   1990 2001 Change Australia 6.7 6.5 (.2) Canada 7.7 5.9 (1.8) France 9.1 8.8 (.3) Germany 5.0 8.1 3.1 Italy 7.0 9.9 2.9 Japan 2.1 4.8 2.7 Sweden 1.8 5.1 3.3 UK 6.9 USA 5.6 4.2 (1.6)

It looks cluttered and its items aren’t helpfully organized It looks cluttered and its items aren’t helpfully organized. In contrast, table 15.6 is clearer because it has an informative title, less visual clutter, and items organized to let us see the pattern more easily: Table 15.6 Change in unemployment rates industrial nations, 1990-2000: English- speaking vs. non-English-speaking nations   1990 2001 Change Canada 7.7 5.9 (1.8) UK 6.9 5.1 USA 5.6 4.2 (1.6) Australia 6.7 6.5 (0.2) France 9.1 8.8 (.3) Japan 2.1 4.8 2.7 Italy 7.0 9.9 2.9 Germany 5.0 8.1 3.1 Sweden 1.8 3.3

Most of the world’s deserts are concentrated in North Africa and the Middle East. Figure 15.4 World’s ten largest deserts. In contrast, figure 15.5 supports the claim with a coherent image. Most of the world’s deserts are concentrated in North Africa and the Middle east.

Designing Tables, Charts, and Graphs Principles for designing effective graphics: Frame each graphic to help readers understand. 1. label every graphic in a way that describes its data; keep titles and legends short but descriptive. a. Avoid making the title or legend a general topic. NOT: Heads of thousands. But: Change in one-and two parent heads of households, 1970-2000 Do not give background information or characterize what the data imply. c. Be sure labels distinguish graphics presenting similar data. NOT: Risk factors for high blood pressure BUT: Risk factors for blood pressure among men in Saudi.

2. Insert to the table or figure info that helps readers see how the data support your point. 3. Introduce the table or figure with a sentence that explains how to interpret it then highlight what is in the table or figure that you want the readers to focus on.

1. Box graphic only if you group two or more figures. Keep all graphics as simple as their content allows, your readers want to know only what is relevant to your point. Include only relevant data. Keep the visual impact simple. 1. Box graphic only if you group two or more figures. 2. Do not color or shade the background.

4. For tables with many rows, lightly shade every fifth row. FOR TABELS: 3. Never use both horizontal and vertical dark lines to divide columns and rows. 4. For tables with many rows, lightly shade every fifth row. FOR CHARTS AND GRAPHS: 5. Use background grid lines only if the graphic is complex or readers need to see precise numbers. 6. Color or shade lines only to show a contrast. 7. Never use iconic bars. 8. Plot data in three dimensions only when your readers are familiar with such graphs and you cannot display the data in any other way.

C. Use clear labels. 1. Label all columns and rows in tables and both axes in charts and graphs. 2. Use tick marks and labels to indicate intervals on the vertical axis of a graph. 3. When specific numbers matter, add them to bar or segments in charts or to dots on lines in graphs. 4. If possible, label lines, bar segments, and the like on the image rather than in legend sit to the side.

15.5 Communicating Data Ethically Your graphic must not be only clear and accurate, it should be HONEST. Don’t distort the image of the data to make your point, for example, the following line figures below display identical data. Yet imply different messages.

Graphs can also mislead by implying false correlation.

Graphs also can mislead reader like the figure blow, both represents same data but you can notice the different in the chats

Any Feedbacks? Thanks for listening :D.