The Professor Proposes
(2 pages of text)
A professor is shopping for a diamond engagement ring. He finds one with certain specifications for a certain price, and wishes to determine if the price of the diamond is fair. He collects data on the prices and characteristics (cut, colour, clarity and carats) of several hundred diamonds from three Internet wholesalers. This case can be used for linear regression analysis with categorical variables as well as other statistical techniques.
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