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Lesson: Comparing Two Distributions Using Dot Plots Mathematics • 7th Grade

In this lesson, we will learn how to compare two data sets distributions using dot plots (line plots).

Lesson Plan

Students will be able to

read a dot plot,
plot a dot plot,
calculate mean, mode, median, range, and interquartile range from a dot plot,
compare the means, modes, medians, ranges, and interquartile ranges of two distributions by looking at dot plots.

Lesson Worksheet

Q1:

True or False: If two dot plots have the same median and range, then they have the same exact shapes of distribution.

Q2:

The following are dot plots of two different data sets, A and B.

Calculate the range of data set A.

Calculate the range of data set B.

Which of the following is true about the variability (spread) of the data?

Q3:

The following dot plots represent the total grades of 25 students last year and this year.

Calculate the mean of the grades for the last year to the nearest whole number.

Calculate the mean of the grades for this year to the nearest whole number.

One of the students reported his grades for this year and last year to his teacher. He got 55 and 70, but he did not mention which grade is for which year.

From the shape of the distribution of data, which grade would you expect to most likely represent his grade last year?