Dot plots are a simple yet powerful tool for displaying frequency counts at a glance. They allow us to see where data is concentrated, where it’s sparse, and if there are any outliers. Today, we’ll explore the utility of dot plots with a couple of illustrative worksheets.
Worksheet 1: Breakfast Time Analysis
The first worksheet presents data from a survey that asked students how long they take to eat breakfast. The dot plot clearly shows that the time students spend on breakfast varies widely, from those who skip it to those who take a leisurely 12 minutes.
Survey Results:
- 0 minutes: 6 students (probably skipping breakfast)
- 1 minute: 2 students (a quick bite)
- 2 minutes: 3 students (a very quick snack)
- 3 minutes: 5 students (perhaps a piece of fruit or a small yogurt)
- 4 minutes: 2 students (maybe a toast or cereal)
- 5 minutes: 5 students (enough for a sandwich or a bowl of oatmeal)
- 6 minutes: 0 students
- 7 minutes: 0 students
- 8 minutes: 2 students (a more relaxed breakfast)
- 9 minutes: 3 students
- 10 minutes: 7 students (a full breakfast)
- 11 minutes: 4 students
- 12 minutes: 1 student
This dot plot is an excellent way to discuss the importance of breakfast and the varied routines of students. Educators can also use the plot for simple statistical calculations, such as:
- The number of students who take 8 minutes or more for their breakfast.
- The percentage of students who finish their breakfast in 5 minutes or less.
- The average time spent on breakfast by the group.
Answer Key
