1. D OT P LOTS

2. D EFINITION A graph 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. S TEPS TO C REATE A D OT P LOT 1. Order numbers from least to greatest. 2. Draw a number line. 3. Label the number line with the minimum and the maximum then all the numbers that fall between them. 4. Put a dot above each number on the number line for each data entry in your set. 5. Don’t forget a title and labels!

4. e.g. 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.

5. Airline Training Program Test New Trainees = 1 person Time in Seconds 6183626364656667686970717273747576777879808182

6. A RE THERE ANY CLUSTERS ? Airline Training Program Test New Trainees = 1 person Time in Seconds 6183626364656667686970717273747576777879808182 Yes!

7. A RE THERE ANY GAPS ? Airline Training Program Test New Trainees = 1 person Time in Seconds 6183626364656667686970717273747576777879808182 Yes!

8. W HAT IS THE MEAN TIME ? Airline Training Program Test New Trainees = 1 person Time in Seconds 6183626364656667686970717273747576777879808182 72.89 seconds

9. W HAT IS THE MEDIAN TIME ? Airline Training Program Test New Trainees = 1 person Time in Seconds 6183626364656667686970717273747576777879808182 73 seconds

10. W HAT IS THE M ODE ? Airline Training Program Test New Trainees = 1 person Time in Seconds 6183626364656667686970717273747576777879808182 71 seconds

11. W HAT IS THE R ANGE ? Airline Training Program Test New Trainees = 1 person Time in Seconds 6183626364656667686970717273747576777879808182 22 seconds

12. T RY AGAIN ! B. In a science class, the students weighed some samples of dirt. The weights of the samples are given below. 1 kg, 3 kg, 6 kg, 2 kg, 1 kg, 2 kg, 7 kg, 2 kg, 3 kg, 2 kg, 4 kg, 3 kg Make a dot plot for the data.

13. A NSWER ! Sample Weights = 1 sample Weight in kilograms 012345678

14. A RE THERE ANY CLUSTERS ? Sample Weights = 1 sample Weight in kilograms Yes! 012345678

15. A RE THERE ANY G APS ? Sample Weights = 1 sample Weight in kilograms Yes! 012345678

16. W HAT IS THE MEAN WEIGHT ? Sample Weights = 1 sample Weight in kilograms 3kg 012345678

17. W HAT IS THE MEDIAN ? Sample Weights = 1 sample Weight in kilograms 2.5 kg 012345678

18. W HAT IS THE M ODE ? Sample Weights = 1 sample Weight in kilograms 2 kg 012345678

19. W HAT IS THE RANGE ? Sample Weights = 1 sample Weight in kilograms 6 kg 012345678

20. W HAT DOES THE RANGE REPRESENT ? Sample Weights = 1 sample Weight in kilograms How spread out the data is 012345678