notes on how to draw bar graphs and histograms
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The document provides information about different types of graphs including bar graphs, double bar graphs, and histograms. It explains how to interpret and construct each type of graph using example data. Bar graphs can display and compare single or multiple data sets using vertical bars of different heights. Double bar graphs are used to compare two related data sets side by side. Histograms are bar graphs that show the frequency distribution of continuous data using equal interval bins on the x-axis. The document demonstrates how to make each graph type by following steps such as choosing scales, drawing bars, and labeling axes.
notes on how to draw bar graphs and histograms
- 1. Bar Graphs and Histograms
- 2. What do you know about bar graph? double bar graph? Histogram?
- 3. Bar Graph 0 200 400 600 800 1000 Spanish Mandarin Hindi English A bar graph can be used to display and compare data The scale should include all the data values and be easily divided into equal intervals.
- 4. How to interpret a Bar Graph? TThhee bbaarr ggrraapphh sshhoowwss MMrr.. SSnnoowwddeenn’’ss How many of Mr. Snowden’s students are band members? How many of Mr. Snowden’s students are not band members? 7 6 5 4 3 2 1 0 Female band Female not band Male band Male not band ssttuuddeennttss bbyy ggeennddeerr aanndd bbaanndd ..mmeemmbbeerrsshhiipp
- 5. Double Bar Graph 90 80 70 60 50 40 30 20 10 0 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Can be used to compare two related sets of data
- 6. How to make a Double- Bar Graph? Choose a scale and interval for the vertical axis. Draw a pair of bars for each country’s data. Use different colors to show males and females. Label the axes and give the graph a title. Make a key to show what each bar represents.
- 7. The table shows the highway speed limits on interstate roads .within three states SSttaattee UUrrbbaann RRuurraall FFlloorriiddaa 6655mmii//hh 7700 mmii//hh TTeexxaass 7700 mmii//hh 7700 mmii//hh VVeerrmmoonntt 5555mmii//hh 6655 mmii//hh
- 8. Step 1 Choose a scale and interval for the vertical axis. 80 60 40 20 0 SSttaattee UUrrbbaann RRuurraall FFlloorriiddaa 6655mmii//hh 7700 mmii//hh TTeexxaass 7700 mmii//hh 7700 mmii//hh VVeerrmmoonntt 5555mmii//hh 6655 mmii//hh
- 9. Step 2 Draw a pair of bars for each state’s data. Use different colors to show urban and rural. 80 60 40 20 0 Florida Texas Vermont SSttaattee UUrrbbaann RRuurraall FFlloorriiddaa 6655mmii//hh 7700 mmii//hh TTeexxaass 7700 mmii//hh 7700 mmii//hh VVeerrmmoonntt 5555mmii//hh 6655 mmii//hh
- 10. Step 3 and 4 Label the axes and give the graph a title. Make a key to show what each bar represents 80 60 40 20 0 Speed Limit on Interstate Roads Florida Texas Vermont (Speed Limit (mi/h Urban Rural
- 11. Histogram Histogram is a bar graph that shows the frequency of data within equal intervals. There is no space in between the bars.
- 12. How to make a histogram?
- 13. The table below shows the number of hours students watch TV in one week Make a histogram of all the data. NNuummbbeerr ooff hhoouurrss ooff TTVV 11 IIII 66 IIIIII 22 IIIIIIII 77 IIIIIIII -- IIIIIIII 33 IIIIIIII -- IIIIIIII 88 IIIIII 44 IIIIIIII -- II 99 IIIIIIII 55 IIIIIIII -- IIIIII
- 14. Step 1 Make a frequency table of the data. Be sure to use equal intervals NNuummbbeerr ooff hhoouurrss ooff TTVV 11 IIII 66 IIIIII 22 IIIIIIII 77 IIIIIIII -- IIIIIIII 33 IIIIIIII -- IIIIIIII 88 IIIIII 44 IIIIIIII -- II 99 IIIIIIII 55 IIIIIIII -- IIIIII NNuummbbeerr ooff hhoouurrss ooff TTVV FFrreeqquueennccyy 11--33 1155 44--66 1177 77--99 1166
- 15. Step 2 Choose an appropriate scale and interval for the vertical axis. The greatest value on the scale should be at least as great as the greatest frequency. NNuummbbeerr ooff hhoouurrss ooff TTVV FFrreeqquueennccyy 11--33 1155 44--66 1177 77--99 1166 20 16 12 8 4 0 1-3 4-6 7-9
- 16. Step 3 Draw a bar for each interval. The height of the bar is the frequency for that interval. Bars must touch but not overlap. Label the axes and give the graph title Hours of Television Watched 20 16 12 8 4 0 1-3 4-6 7-9 Hours Number of students NNuummbbeerr ooff hhoouurrss ooff TTVV FFrreeqquueennccyy 11--33 1155 44--66 1177 77--99 1166
- 17. Hours of Television Watched 20 16 12 8 4 0 1-3 4-6 7-9 Hours Number of students
- 18. Can you now make a bar graph, double bar Graph and a histogram?
- 19. The list below shows the results of a typing test in words per minute. Make a histogram of the data. 62, 55, 68, 47, 50, 41, 62, 39, 54, 70, 56, 70, 56, 47, 71, 55, 60, 42
- 20. The end