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Introduction to Dot Plots
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Definition A data display in which each data item is shown as a dot above a number line In a dot plot a cluster shows where a group of data points fall. A gap is an interval where there are no data items.
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Outliers- What’s THAT?????? When a dot is plotted far away from the cluster it skews the mean away from the middle.
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There are two types of data we will be looking at
Categorical Data - places someone or something into several groups or categories. For example: favorite color, job titles, names of students, etc.
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Categorical
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Quantitative Data Measures numerical values. For example: age, height, number of siblings, etc.
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Sample with Quantitative Data
Ages of People at Pool
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Steps to Create a Dot Plot
Order numbers from least to greatest. Draw a number line. Label the number line with the minimum and the maximum then all the numbers that fall between them. Put a dot above each number on the number line for each data entry in your set. Don’t forget a title and labels!
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Display the data in a dot plot.
You try it! In an airline training program, the students are given a test in which they are given a set of tasks and the time it takes them to complete the tasks is measured. The following is a list of the time (in seconds) for a group of new trainees. 61, 61, 64, 67, 70, 71, 71, 71, 72, 73, 74, 74, 75, 77, 79, 80, 81, 81, 83 Display the data in a dot plot.
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Airline Training Program Test
Answer! Airline Training Program Test New Trainees = 1 person Time in Seconds 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83
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Airline Training Program Test
Are there any clusters? Airline Training Program Test New Trainees = 1 person Time in Seconds Yes! 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83
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Airline Training Program Test
Are there any gaps? Airline Training Program Test New Trainees = 1 person Time in Seconds Yes! 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83
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Airline Training Program Test
What is the Mean time? Airline Training Program Test New Trainees = 1 person Time in Seconds 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83
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Airline Training Program Test
What is the median time? Airline Training Program Test New Trainees = 1 person Time in Seconds 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83
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Airline Training Program Test
What is the Mode? Airline Training Program Test New Trainees = 1 person Time in Seconds 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83
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Airline Training Program Test
What is the Range? Airline Training Program Test New Trainees = 1 person Time in Seconds 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83
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Complete the worksheet and turn it in for a grade.
Make sure your name is on it.
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