Dot Plots

Warmup

Fifteen customers in a pizza shop were asked, “How many toppings did you add to your cheese pizza?”

(1.) Could you use a dot plot to represent the data? Explain your reasoning.

(2.) Complete the table.

Activity #1

Use Data to Create a Dot plot.

  • Use the data from the warm-up above to display the number of toppings as a dot plot.
  • Label your drawing clearly.

Use your dot plot to study the distribution for number of toppings.

(1.) What do you notice about the number of toppings that this group of customers ordered?

(2.) Write 2–3 sentences summarizing your observations.

(3.) Think of a statistical question that can be answered with the data about the number of toppings ordered, as displayed on the dot plot.

(4.) Answer the statistical question that you just wrote above.

Activity #2

Observe Dot Plot from Data.

The table below shows the high temperature in degrees in a city for 11 days.

  • Check the box to see the dot plot for the data. For new data, use the “DataSet” slider.
  • Use “Seed” slider to increase the data.

Activity #3

Creating a Pie Chart From a Dot Plot

  • Drag point A on the left to change the dot plot distribution. ​
  • Observe the corresponding changes in the pie chart on the right. ​
  • Click on for a different dot plot.

Challenge #1

A movie theater is showing three different movies. The dot plots represent the ages of the people who were at the Saturday afternoon showing of each of these movies.

(1.) One of these movies was an animated movie rated G for general audiences. Do you think it was movie A, B, or C? Explain your reasoning.

(2.) Which movie has a dot plot with ages that center at about 30 years?

(3.) What is a typical age for the people who were at Movie A?

Challenge #2

The dot plot below shows a sample of 13 times between eruptions for Yellowstone Park’s Old Faithful Geysers. 

Answer the questions first before checking the answer box. ​Use the “Problem” slider to do more.

Challenge #3

Clare recorded the amounts of time spent doing homework, in hours per week, by students in sixth, eighth, and tenth grades. She made a dot plot of the data for each grade and provided the following summary.

  • Students in sixth grade tend to spend less time on homework than students in eighth and tenth grades.
  • The homework times for the tenth-grade students are more alike than the homework times for the eighth-grade students.