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### Course: Statistics and probability > Unit 6

Lesson 5: Experiments# Principles of experiment design

A footwear company wants to test the effectiveness of its new insoles designed to prevent shin splints resulting from running. They hire a group of physical trainers and a statistician, who recruits $100$ healthy adults between the ages of $18$ and $24$ to participate in a study.

The statistician randomly assigns $50$ of the adults to follow a weekly running schedule with the new insoles and the other $50$ to the same running schedule with the existing insoles the company already sells. After $10$ weeks, the statistician records the number of runners from each group that have developed shin splints.

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