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设随机变量，，且相关系数，则

A．

B．

C．

D．

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近似计算定积分的抛物线公式是： A、正确 B、错误

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For a linear regression model with i.i.d. sample: , under conditional heteroskedasticity, usually which of the following statement does not hold: A、OLS estimator is the best linear unbiased estimator B、consistency C、asymptotic normal D、a robust test should be used, rather than the standard test

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