Lesson 2

Using Dot Plots to Answer Statistical Questions

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Problem 1

Three sets of data about ten sixth-grade students were used to make three dot plots. The person who made these dot plots forgot to label them. Match each dot plot with the appropriate label.

Three dot plots labeled A, B, C.
A:

Dot Plot A

B:

Dot Plot B

C:

Dot Plot C

1:

Ages in years

2:

Numbers of hours of sleep on nights before school days

3:

Numbers of hours of sleep on nights before non-school days

Solution

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Problem 2

The dot plots show the time it takes to get to school for ten sixth-grade students from the United States, Canada, Australia, New Zealand, and South Africa.

Five dot plots. 
  1. List the countries in order of typical travel times, from shortest to longest.
  2. List the countries in order of variability in travel times, from the least variability to the greatest.

Solution

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Problem 3

Twenty-five students were asked to rate—on a scale of 0 to 10—how important it is to reduce pollution. A rating of 0 means “not at all important” and a rating of 10 means “very important.” Here is a dot plot of their responses.

A dot plot, importance of reducing pollution, 2 to 10 by ones. Beginning with 2, the number of dots above each increment is 1, 1, 1, 2, 2, 2, 5, 5, 6.

Explain why a rating of 6 is not a good description of the center of this data set.

Solution

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