<p style="text-align:justify"><span style="font-size:14px">After deciding which graph best represents your data, you may need to present your statistical data to a class or other group in an oral report or multimedia presentation. When giving an oral presentation, you must be prepared to explain exactly how you collected or calculated the data, as well as why you chose the categories, scales, and types of graphs that you are showing. Although you may have made numerous graphs of your data, be sure to use only those that actually demonstrate the stated intentions of your statistical study. While preparing your presentation, be sure that all colors, text, and scales are visible to the entire audience. Finally, make sure to allow time for your audience to ask questions and be prepared to answer them. </span></p>

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<p><span style="font-size:14px"><strong>Example 1.11 </strong></span></p>

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<p style="text-align:justify"><span style="font-size:14px">Suppose the guidance counselors at De Anza and Foothill need to make an oral presentation of the student data presented in Figures 1.5 and 1.6. Under what context should they choose to display the pie graph? When might they choose the bar graph? For each graph, explain which features they should point out and the potential display problems that might exist.</span></p>

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<p style="text-align:justify"><span style="font-size:14px"><strong>&nbsp;Solution 1.11</strong> </span></p>

<p style="text-align:justify"><span style="font-size:14px">The guidance counselors should use the pie graph if the desired information is the percentage of each school&rsquo;s enrollment. They should use the bar graph if knowing the exact numbers of students and the relative sizes of each category at each school are important points to be made. For the pie graph, they should point out which color represents part-time students and which represents full-time students. They should also be sure that the numbers and colors are visible when displayed. For the bar graph, they should point out the scale and the total numbers for each category, and they should be sure that the numbers, colors, and scale marks are all displayed clearly.</span></p>