### CSI: The Experience

CSI: The Experience -- No Bones About It

## PROBLEM:

At a nearby construction zone, workers have made a startling discovery. They uncovered several bones that look like they were buried some time ago. You are part of a team of forensic anthropologists who have been called in to analyze these bones.

Unfortunately, the bones were heavily damaged by the construction equipment. The bones have all been mixed up, and several have been crushed. However, we think you can use the bones that are left to:

1) determine how many people were buried at this location

2) determine the heights of the different individuals.

## Classroom Measurements

1. Using a metric measuring tape, measure the length of your femur (thigh bone) in centimeters. This is the large bone that runs from your hip socket to your knee cap. Record this information on your table.
2. Have a partner measure your actual height in centimeters. Record this information on your table.
3. Collect the same information (femur length and height) from five other classmates.
4. Leave the "calculated height" row blank for now.
Use the graph paper on the back of your handout to graph the data you've collected. Use Femur Length for the x-axis and Height for the y-axis.

What relationship is there between the length of someone's femur bone and their height?

## Formulas for Calculating Height

Anthropologists have performed hundreds of calculations like the one we just did. Their calculations showed that a person's height can be estimated using the lengths of the long bones of the body--the femur, tibia, and tibia in the leg, and the ulna, radius, and humerus of the arm.

However, the relationship between the length of these bones and a person's height is different for men and women, and for people from different races. The table below lists the equations forensic anthropologists use to estimate a person's height based on the femur.

Use the table to fill in the "Calculated Height" row on your table for all six people.

## ANALYSIS OF BONES FROM CONSTRUCTION SITE

The following bones were recovered from the construction site. A fellow forensic anthropologist has already classified the bones by sex and race. Using the mathematical formulas below, calculate the approximate height of each individual to complete the table.