Gary Loveman was a professor at Harvard Business School before becoming the CEO of Harrahs, one of the largest casino companies in the world. When he moved to Harrahs, Loveman transformed the company with a frequent flier-like loyalty program that collected tremendous amounts of data about customer behavior. On top of this always-on measurement system, the company began running experiments. For example, they might run an experiment to evaluate the effect of a coupon for a free hotel night for customers with a specific gambling pattern. Heres how Loveman described the importance of experimentation to Harrahs everyday business practices:

...Youvegotto have a control group. This is one of the things that you can lose your job for at Harrahsnot running a control group.(Manzi 2012, 146)

Write an email to a new employee explaining why Loveman thinks it is so important to have a control group. You should try to include an exampleeither real or made-upto illustrate your point.