Introduction to Dot Plots

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Presentation transcript:

Introduction to Dot Plots

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.

Outliers- What’s THAT?????? When a dot is plotted far away from the cluster it skews the mean away from the middle.

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.

Categorical

Quantitative Data Measures numerical values. For example: age, height, number of siblings, etc.

Sample with Quantitative Data Ages of People at Pool

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!

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.

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

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

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

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

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

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

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

Complete the worksheet and turn it in for a grade. Make sure your name is on it.