In this Grade 7 Illustrative Mathematics lesson, students learn how to compare two groups of data using measures of center such as mean and median alongside measures of variability such as mean absolute deviation (MAD) and interquartile range. Using real-world contexts like team heights and song lengths, students practice creating and interpreting dot plots to determine whether differences between groups are meaningful. The lesson builds statistical reasoning skills by showing how a single summary statistic must be considered alongside spread to draw valid comparisons.
Section 1
Visualizing Data Distributions with Double Dot Plots
A double dot plot displays two data sets on the same number line using different symbols or colors, allowing direct visual comparison of distribution shapes, centers, spreads, and overlap between populations.
Section 2
Defining Population and Sample
A population is the complete set of all individuals or items that we want to study and draw conclusions about. A sample is a subset of the population that is actually observed or measured to gather data.
Expand to review the lesson summary and core properties.
Section 1
Visualizing Data Distributions with Double Dot Plots
A double dot plot displays two data sets on the same number line using different symbols or colors, allowing direct visual comparison of distribution shapes, centers, spreads, and overlap between populations.
Section 2
Defining Population and Sample
A population is the complete set of all individuals or items that we want to study and draw conclusions about. A sample is a subset of the population that is actually observed or measured to gather data.