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The price of a diamond increases with its weight (measured in carat). A data analyst proposes the following model for the price of diamond: price

The price of a diamond increases with its weight (measured in carat). A data analyst proposes the following model for the price of diamond: price = Bo + B1x + B2x^2 + e, where x is the carat of a diamond. When the carat of a diamond increases, its price increases at an increasing rate. What is the expected sign for B2

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