# Comparing Mean Absolute Deviation

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## Objective

SWBAT: â¢ Collect and display data in a table and line plot â¢ Define mean absolute deviation. â¢ Calculate the mean and mean absolute deviation of a data set. â¢ Compare the distribution of two data sets using mean absolute deviation. â¢ Use Microsoft Excel to analyze data.

#### Big Idea

What does the mean absolute deviation tell us? Students use the data they collected in the previous lesson and Microsoft Excel to analyze data sets.

## Do Now

7 minutes

See my Do Now in my Strategy folder that explains my beginning of class routines.

Often, I create do nows that have problems that connect to the task that students will be working on that day.  Today I want students to analyze a line graph in order to answer questions. Each edition of Scholastic News  typically includes a graph at the end each edition.

I ask for students to share their thinking.  Students are engaging in MP3: Construct viable arguments and critique the reasoning of others.

## Measures of Variability Review

5 minutes

I review the vocabulary with students.  If students struggle to remember the definitions, I have them review their notes from the previous lesson.  I want students to be able to explain that the MAD is the average distance from each value in a data set and the mean.  I also want students to understand that the MAD is a measure of variability since it deals with the spread of values in a data set.

## Mean Absolute Deviation Review

10 minutes

I explain that Data Set E and F came from two groups of people measuring how long each person thought it took for 30 seconds to pass.  Students use the data in the tables to create two line plots.  I have students work in partners to create line plots and calculate the mean absolute deviation.

As students work, I walk around and monitor student behavior and progress.  If students struggle to complete a step, I tell them to look at their notes from the previous lesson.

15 minutes

Notes:

• I Create Heterogeneous Groups of 4 students.