题目
题目
单项选择题

Which of the following statements is correct?  

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思路分析
The question asks: Which of the following statements is correct? and provides an empty set of answer options, with only one statement listed in the answer field. Because there are no answer choices shown, we cannot evaluate multiple options or contrast them. Instead, we can address the single provided statement and explain its validity in the c......Login to view full explanation

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You have data on the training regime of 100m elite runners. For each runner you observe their best run of the year (in second) ([math: pb] ), the number of hours they train each week ([math: tr]) and a dummy variable equal to 1 if their are male ([math: male]). Using OLS you get the following regression: [math: pb^=36.2−1.3male−0.92tr+0.009tr2−0.09male∗tr+0.001male∗(tr2)]\hat {pb}= 36.2 - 1.3 male - 0.92 tr + 0.009 tr^2 - 0.09 male*tr + 0.001 male*(tr^2) How many hours should a male elite runner train each week to minimize the time of their best run of the year? (round to the closest decimal)

You have data on the training regime of 100m elite runners. For each runner you observe their best run of the year (in second) (pb ), the number of hours they train each week (tr) and a dummy variable equal to 1 if their are male (male). Using OLS you get the following regression: \hat {pb}= 36.2 - 1.3 male - 0.92 tr + 0.009 tr^2 - 0.09 male*tr + 0.001 male*(tr^2) How many hours should a male elite runner train each week to minimize the time of their best run of the year? (round to the closest decimal)

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