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# Using Numbers

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The presentation focuses on how journalists should use numbers to report trends. I include examples of how to calculate percentages and percentage points.

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### Using Numbers

1. 1. Using Numbers to Report Trends<br />A Lecture<br />
2. 2. Keep your C.H.I.N. Up<br />Context: Why is this story important now?<br />Human Element: Give us a quote.<br />Impact: How does this affect your reader?<br />News: Who? What? When? Where?<br />
3. 3. Let’s Add Some Numbers<br />
4. 4. Definition of Percent<br />Percent means per hundred.<br />If you leave a 10% tip, you’ve given the server a dime per each \$1 of food.<br />
5. 5. How to calculate percent<br />Of the 600,000 residents of Baltimore, 300,000 are African American.<br />What percent is that?<br />Part/whole X 100% = percent<br />So, 300,000/600,000 = 50%<br />
6. 6. Now you try…<br />Of the 24 people in this class, 6 are men.<br />What percentage of the class is male?<br />
7. 7. The answer<br />Part/whole *100 = percentage<br />6/24 * 100 = 25%<br />
8. 8. How to change a percent into a regular number…<br />Forty percent of the 500 survey respondents said they will vote for Sen. Barack Obama. <br />Whole x percent = part<br />500 X 40% = 500 x 0.40 = 200<br />
9. 9. How to calculate a percentage change<br />This year, the number of new voters has increased dramatically. Last election cycle, 200,000 new registrants surfaced. This year, 300,000 new registrants signed up.<br />(New Value-Old Value) ÷ Old Value X 100<br />(300,000-200,000) ÷ 200,000 x 100 = ?<br />
10. 10. The Answer<br />(300,000-200,000) ÷ 200,000 x 100 = ?<br />The change is 50%<br />
11. 11. The most important thing to remember…<br />There is a difference between a percentage and a percentage point.<br />For instance, if we say, “Barack Obama would like to raise taxes on upper-class Americans, from 10% to 20%...”<br />That is a change of 10 PERCENTAGE POINTS. (20-10 = 10)<br />What is the percentage increase?<br />
12. 12. Let’s Hear How the Pros Do It<br />
13. 13. Now you try…<br />Find this statistic:<br />The number of new voters in your home state this election cycle.<br />The number of new voters last election cycle.<br />Calculate the percentage increase/decrease.<br />Calculate the percentage point change.<br />
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