## 3.8 Activity: Strength shoe

The Strength Shoe is a modified athletic shoe with a 4-cm platform attached to the front half of the sole. Its manufacturer claims that this shoe can increase a person’s jumping ability. A 1993 study published in the American Journal of Sports Medicine investigated the Strength Shoe claim using 12 intercollegiate track and field athletes as study participants. In this activity you will be replicating this investigation using data collected from 12 other subjects, to examine the following question:

How can we make “equivalent” experimental groups?

### 3.8.1 Confounding variables

To access the activty
3.8.1: Strength shoe: Confounding variables
3.8.2: Strength shoe: Random assignment