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Statistics and Data (Graphical)

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Statistics Displaying Categorical Data Stemplots Frequency Tables Histograms Time Plots … and why Graphical displays of data are increasingly prevalent in professional and popular media. We all need to understand them.

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Cause of DeathNumber of Percentage Deaths Heart Disease 616, Cancer 562, Stroke 135, Chronic Lower Respiratory 127, Accidents 123, Alzheimer’s 74, Diabetes 71, Influenza & Pneumonia 52, Other 658, Source: Centers for Disease Control and Prevention, as reported on

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Causes of Death in the United States in 2010

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Data set: Key: 1|0 = StemLeaf Stem-and-leaf plot: an arrangement of digits that is used to display and order numerical data.

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Data set: StemLeaf Key: 20|1 =

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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.

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Histogram is a bar graph that shows the frequency of data within equal intervals. There is no space in between the bars.

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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 III6II1 IIII - IIII 7IIII2 III8 3 IIII9 IIII - I IIII - I4 IIII - III IIII - III5

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Step 1 Make a frequency table of the data. Be sure to use equal intervals.Frequency Number of hours of TV III6II1 IIII - IIII7IIII2 III8IIII - IIII3 IIII9 IIII - I4 IIII - III5

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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. 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

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Text pg769 Exercises #23 and #24

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