Essay
A pharmaceutical company wants to test its new drug that is designed to help balding men grow more hair. From their records of past customers, the company has data on about 5,000 men. The data contains information about the men's hair color, age, and percent of baldness. (A partial list is given below.) For their anticipated experiment, they want to take a sample that is representative of their customers. 
(a)Briefly describe how you would select a simple random sample of size n = 20 from this list of customers.
(b)Describe in a short paragraph why you might wish to use a stratified random sample.
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