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Bar graphs

How to create bar graphs

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Bar graphs

  1. 1. Bar Graphs <ul><li>Used on categorial data </li></ul><ul><li>Count how many for each group </li></ul><ul><li>Can be made from counts or percents </li></ul><ul><ul><li>Counts- how many you actually have for each group </li></ul></ul><ul><ul><li>Percents- count/ total </li></ul></ul>Mrs. Kristen Ulshafer Mathematics Teacher 6/16/2011 Marital Status Count (millions) Percent Never Married 43.9 22.9 Married 116.7 60.9 Widowed 13.4 7.0 Divorced 17.6 9.2 191.6 100
  2. 2. Bar Graphs Steps in Creating a Bar Graph 1. Draw horizontal (x ) and vertical (y) axes 2. Label horizontal and vertical axes Horizontal should always be the count or percentage Vertical should be the groups 3. Equally spaced vertical axis
  3. 3. Pie Charts <ul><li>Used on categorial data </li></ul><ul><li>Always a percent </li></ul><ul><li>Graph shows how much of the whole each category takes up </li></ul><ul><li>Must know the total </li></ul><ul><li>Percents have to add up to 100% (or very close with rounding) </li></ul><ul><li>Each count must be able to fit in exactly 1 category </li></ul>
  4. 4. Example 1: Here are data on the percent of females among people earning doctorates in 1994 in several fields of study. a) Create a bar graph b) Can you make a pie chart? Why or why not? No, the percents do not add up 100. Computer Science 15.4% Life Sciences 40.7% Education 60.8% Physical Sciences 21.7% Engineering 11.1% Psychology 62.2%
  5. 5. Example 2: In 1995, there were 90,402 deaths from accidents in the United States. Among these were 43,363 deaths from motor vehicle accidents, 10,483 from falls, 9072 from poisoning, 4350 from drowning, and 4235 from fires. a) Create a chart, show the percentages and include an “other” category b) Create a bar graph based on the percents c) Can you make a pie chart from this data? Why or why not? Yes because your percents add up to 100. Also, each death can be in only 1 category. Accident Count Percent Motor vehicle 43,363 43363/90402 48 Falls 10,483 10483/90402 12 Poisoning 9,072 9072/90402 10 Drowning 4,350 4350/90402 5 Fires 4,235 4235/90402 5 Other 18899 18899/90402 21

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How to create bar graphs


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