## Instructor Overview

Students estimate the length of 50 seconds by starting an unseen timer and stopping it when they think 50 seconds has elapsed. The third attempt is recorded and compiled into a data set, which students then compare to the third attempt from the previous lesson when they estimated the length of 20 seconds. Students analyze the data to make conclusions about how well seventh grade students can estimate lengths of time.

Students repeat the timing activity for 50 seconds, but only the third trial is recorded. The task today is to compare this set of data with the third trial for 20 seconds. Students will need to deal with the difference in the spread of data, as well as how to compare the data sets. Students will be reminded of Mean Absolute Deviation (MAD), which will be a useful tool in this situation.

# Key Concepts

Students apply the tools learned in Unit 6.8:

- Measures of center and spread
- Mean absolute deviation (MAD)

# Goals and Learning Objectives

- Apply knowledge of statistics to compare different sets of data.
- Use measures of center and spread to analyze data.

## Comments

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