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Reporting Frequency Frequency Tables Histograms.

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Presentation on theme: "Reporting Frequency Frequency Tables Histograms."— Presentation transcript:

1 Reporting Frequency Frequency Tables Histograms

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3 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.

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

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

6 Construct a Frequency Table (tally sheet) Count the tallies and put the total for each value in the frequency column Data Value TallyFrequency

7 Construct a Frequency Table (tally sheet) Count the tallies and put the total for each value in the frequency column Data Value TallyFrequencyPercent We can find the percent in each row by dividing by the total. 17 1/17=0.0586% 1/17=0.0586% 4/17= % 2/17= % 3/17= % 4/17= % 2/17= %

8 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

9 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.

10 Histogram Frequency Test Scores Class Test Scores

11 95 flashlights are tested until they fail. The table gives the times taken ( hours ) until failure. Time to failure (hours) Number of components Find 2 or more things wrong with the histogram which represents the data in the table. Histograms

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

13 Line Plot Favorite Colors X XXX XXXX XXXXX RedBlueGreenYellowPurple

14 Histogram 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.

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16 Reporting Frequency Frequency Tables Histograms


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