Vernier Software & Technology

# Tracks of a Killer

## Introduction

The body of famous pop music producer Jonathan Wallace was found in his bathtub. It is our hypothesis that an intruder surprised the victim and drowned him. The only clue at the crime scene was a set of muddy footprints leading from a nearby window to the bathroom and back again. The footprints were smeared, so their exact size could not be determined. The soles of the shoes had no pattern. It will be difficult to match the footprints to any particular pair of shoes.

## Objectives

• Determine if there is a relationship between the length of a person's stride and his or her height.
• Determine if there is a relationship between the size of a person's shoes and his or her height.
• Efficiently gather data to test for correlations between height, shoe size, and stride length.
• Use a linear regression model of the data to predict height based on stride length.

## Sensors and Equipment

No probeware required for this experiment.

## Forensics with Vernier

See other experiments from the lab book.

 1 Tracks of a Killer 2 Bouncing Back 3 Name That Tune 4 Making Cents of Math: Linear Relationship between Weight and Quantity 5 The Ink is Still Wet 6 Speeding Up 7 Drug Tests 8 No Dumping 9 Killer Cup of Coffee 10 Dropped at the Scene 11 Ashes to Ashes 12 Hit and Run 13 Life in the Fast Lane 14 Chill Out: How Hot Objects Cool

### Experiment 1 from Forensics with Vernier Lab Book

#### Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.