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 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!

YOU TRY IT! A. 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.

ANSWER! Airline Training Program Test New Trainees = 1 person Time in Seconds

ARE THERE ANY CLUSTERS? Airline Training Program Test New Trainees = 1 person Time in Seconds Yes!

ARE THERE ANY GAPS? Airline Training Program Test New Trainees = 1 person Time in Seconds Yes!

WHAT IS THE AVERAGE TIME? Airline Training Program Test New Trainees = 1 person Time in Seconds About 73 seconds

WHAT IS THE MEDIAN TIME? Airline Training Program Test New Trainees = 1 person Time in Seconds seconds

WHAT IS THE MODE? Airline Training Program Test New Trainees = 1 person Time in Seconds seconds

WHAT IS THE RANGE? Airline Training Program Test New Trainees = 1 person Time in Seconds seconds

WHAT DOES THE MEDIAN REPRESENT? Airline Training Program Test New Trainees = 1 person Time in Seconds The center of the data set.

WHAT DOES THE RANGE REPRESENT? Airline Training Program Test New Trainees = 1 person Time in Seconds The variation in the data set.

TRY AGAIN! B. 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.

ANSWER! Sample Weights = 1 sample Weight in pounds

ARE THERE ANY CLUSTERS? Sample Weights = 1 sample Weight in pounds Yes!

ARE THERE ANY GAPS? Sample Weights = 1 sample Weight in pounds Yes!

WHAT IS THE AVERAGE WEIGHT? Sample Weights = 1 sample Weight in pounds /8 or lb

WHAT IS THE MEDIAN? Sample Weights = 1 sample Weight in pounds /16 or lb

WHAT IS THE MODE? Sample Weights = 1 sample Weight in pounds /8 or 1/4 lb

WHAT IS THE RANGE? Sample Weights = 1 sample Weight in pounds /8 or 0.75 lb

WHAT DOES THE AVERAGE REPRESENT? Sample Weights = 1 sample Weight in pounds The center of the data set.

WHAT DOES THE RANGE REPRESENT? Sample Weights = 1 sample Weight in pounds The variation in the data set.

EXIT SLIP! Mrs. Whitesides took a survey of ten 6 th 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.