Lesson objective: Understand that measures of center and variability can be used together to describe and analyze a data set.

Students bring prior knowledge of what measures of center and variability represent from 6.SP.3. This prior knowledge is extended to analysis as students use the measures of center and variability to describe the center, spread, and shape of a data set. A conceptual challenge students may encounter is understanding that all measures of center and variability must be used together in order to analyze the data set.

The concept is developed through work with dot plots, which give a clear visual of the spread and distribution of the data set.

This work helps students deepen their understanding of number because the measures of center and variability represent different parts of the data. Using these measures together will give a holistic description and analysis of the data.

Students engage in Mathematical Practice 3 (construct viable arguments) as they create a dot plot that supports the data from Ms. Romero's class. After creating the dot plot, students will compare the dot plots and data from both classes to create an argument to support the winner.

**Key vocabulary:**

- distribution
- dot plots
- mean
- median
- measures of center
- measures of variability
- mode
- normal distribution
- range
- skewed

**Special materials needed:**