Understanding Bar Graphs, Double Bar Graphs, and Histograms
Bar graphs are useful for displaying and comparing data, while double bar graphs help compare two related datasets. Histograms show the distribution of data. Learn how to interpret and create these visual representations effectively with examples provided.
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Bar Graphs and Histograms PRINCESS C. BARCEGA APG SCHOOL, MANAMA, BAHRAIN Powerpoint hosted on www.worldofteaching.com Please visit for 100 s more free powerpoints
What do you know about bar graph? double bar graph? Histogram?
Bar Graph 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. Spanish Mandarin Hindi English 0 200 400 600 800 1000
How to interpret a Bar Graph? The bar graph shows Mr. Snowden s students by gender and band membership. 7 How many of Mr. Snowden s students are band members? How many of Mr. Snowden s students are not band members? 6 5 4 3 2 1 0 Female band Female not band Male band Male not band
Double Bar Graph Can be used to compare two related sets of data 90 80 70 60 50 40 30 20 10 0 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr
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.
The table shows the highway speed limits on interstate roads .within three states State Urban Rural Florida 65mi/h 70 mi/h Texas 70 mi/h 70 mi/h Vermont 55mi/h 65 mi/h
Step 1 Choose a scale and interval for the vertical axis. 80 60 40 State Urban Rural Florida 65mi/h 70 mi/h 20 Texas 70 mi/h 70 mi/h 0 Vermont 55mi/h 65 mi/h
Draw a pair of bars for each state s data. Use different colors to show urban and rural. Step 2 80 State Florida Texas Vermont Urban 65mi/h 70 mi/h 55mi/h Rural 70 mi/h 70 mi/h 65 mi/h 60 40 20 0 Florida Texas Vermont
Step 3 and 4 Speed Limit on Interstate Roads 80 Urban Label the axes and give the graph a title. Make a key to show what each bar represents Rural Speed Limit (mi/h) 60 40 20 0 Florida Texas Vermont
Histogram Histogram is a bar graph that shows the frequency of data within equal intervals. There is no space in between the bars.
The table below shows the number of hours students watch TV in one week Make a histogram of all the data. Number of hours of TV 1 II 6 III 2 IIII 7 IIII - IIII 3 IIII - IIII 8 III 4 IIII - I 9 IIII 5 IIII - III
Make a frequency table of the data. Be sure to use equal intervals Step 1 Number of hours of TV Frequency Number of hours of TV II IIII IIII - IIII IIII - I IIII - III 1-3 4-6 7-9 15 17 16 1 2 3 4 5 6 7 8 9 III IIII - IIII III IIII
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. 20 16 Number of hours of TV Frequency 12 8 1-3 4-6 7-9 15 17 16 4 0 1-3 4-6 7-9
Step 3 Hours of Television Watched 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 20 16 Number of students 12 8 Number of hours of TV Frequency 4 0 1-3 4-6 7-9 15 17 16 1-3 4-6 7-9 Hours
Hours of Television Watched 20 Number of students 16 12 8 4 0 1-3 4-6 7-9 Hours
Can you now make a bar graph, double bar Graph and a histogram?
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
