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Reporting Frequency

Learn how to construct frequency tables and histograms, and understand their importance in analyzing data. Explore examples and find out the common mistakes to avoid.

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Reporting Frequency

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  1. Reporting Frequency Frequency Tables Histograms

  2. What is a Frequency Table? • A Frequency table is a table that lists each item in a data set with the number of times it occurs.

  3. Construct a Frequency Table (tally sheet) 7, 10, 10, 9, 8, 9, 7, 4, 3, 7, 10, 4, 8, 9, 6, 7, 10 Enter the data value into the 1st column

  4. Construct a Frequency Table (tally sheet) 7, 10, 10, 9, 8, 9, 7, 4, 3, 7, 10, 4, 8, 9, 6, 7, 10 Enter a tally for each entry.

  5. Construct a Frequency Table (tally sheet) Count the tallies and put the total for each value in the frequency column 1 2 1 4 2 3 4

  6. Making a Line plot • x x • x x x • x x x x x • x x x x x x x What is the range? 7 3 4 5 6 7 8 9 10

  7. What is a Histogram? • A histogram is a bar graph with no spaces between the bars. The height of each bar shows the frequency of data within that interval. The intervals of a histogram are of equal size and do not overlap.

  8. Histogram Class Test Scores Frequency Test Scores

  9. Histograms 95 flashlights are tested until they fail. The table gives the times taken ( hours ) until failure. Find 2 or more things wrong with the histogram which represents the data in the table.

  10. Histograms Answer: Time taken for 95 components to fail • There is no title. • There are no units on the x-axis. Time to failure (Hours)

  11. Histograms are used to show the frequency of data. Very similar to bar graphs, but use intervals on the X axis. Bars do touch. Histograms have a title. Histograms have two axes which are labeled. Histogram

  12. Reporting Frequency Frequency Tables Histograms

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