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DOT PLOTS

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. HOW TO MAKE A DOT PLOT VIDEO. STEPS TO CREATE A DOT PLOT.

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DOT PLOTS

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  1. DOT PLOTS

  2. 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.

  3. HOW TO MAKE A DOT PLOT VIDEO

  4. 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!

  5. 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.

  6. 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

  7. 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

  8. 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

  9. WHAT IS THE AVERAGE TIME? Airline Training Program Test New Trainees = 1 person Time in Seconds About 73 seconds 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83

  10. WHAT IS THE MEDIAN TIME? Airline Training Program Test New Trainees = 1 person Time in Seconds 73 seconds 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83

  11. WHAT IS THE MODE? Airline Training Program Test New Trainees = 1 person Time in Seconds 71 seconds 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83

  12. WHAT IS THE RANGE? Airline Training Program Test New Trainees = 1 person Time in Seconds 22 seconds 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83

  13. WHAT DOES THE MEDIAN REPRESENT? Airline Training Program Test New Trainees = 1 person Time in Seconds The center of the data set. 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83

  14. WHAT DOES THE RANGE REPRESENT? Airline Training Program Test New Trainees = 1 person Time in Seconds The variation in the data set. 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83

  15. TRY AGAIN! • In a science class, the students weighed some samples of dirt to the nearest 1/8 pound. The weights of the samples are given below. 1/8 lb, 3/8 lb, ¾ lb, ¼ lb, 1/8 lb, ¼ lb, 7/8 lb, ¼ lb, 3/8 lb, ¼ lb, ½ lb, 3/8 lb Make a dot plot for the data.

  16. ANSWER! Sample Weights = 1 sample Weight in pounds 0 1 8 2 8 3 8 4 8 5 8 6 8 7 8 1

  17. ARE THERE ANY CLUSTERS? Sample Weights = 1 sample Weight in pounds Yes! 0 1 8 2 8 3 8 4 8 5 8 6 8 7 8 1

  18. ARE THERE ANY GAPS? Sample Weights = 1 sample Weight in pounds Yes! 0 1 8 2 8 3 8 4 8 5 8 6 8 7 8 1

  19. WHAT IS THE AVERAGE WEIGHT? Sample Weights = 1 sample Weight in pounds 3/8 or 0.375 lb 0 1 8 2 8 3 8 4 8 5 8 6 8 7 8 1

  20. WHAT IS THE MEDIAN? Sample Weights = 1 sample Weight in pounds 5/16 or 0.3125 lb 0 1 8 2 8 3 8 4 8 5 8 6 8 7 8 1

  21. WHAT IS THE MODE? Sample Weights = 1 sample Weight in pounds 2/8 or 1/4 lb 0 1 8 2 8 3 8 4 8 5 8 6 8 7 8 1

  22. WHAT IS THE RANGE? Sample Weights = 1 sample Weight in pounds 6/8 or 0.75 lb 0 1 8 2 8 3 8 4 8 5 8 6 8 7 8 1

  23. WHAT DOES THE AVERAGE REPRESENT? Sample Weights = 1 sample Weight in pounds The center of the data set. 0 1 8 2 8 3 8 4 8 5 8 6 8 7 8 1

  24. WHAT DOES THE RANGE REPRESENT? Sample Weights = 1 sample Weight in pounds The variation in the data set. 0 1 8 2 8 3 8 4 8 5 8 6 8 7 8 1

  25. EXIT SLIP! Mrs. Whitesides took a survey of ten 6th grade students. She asked each student how many items they recycle in a day. Below are her results. 0, 1, 1, 1, 2, 2, 2, 3, 3, 5 Make a dot plot to display this data.

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