Which of the following is not a requirement that OLS estimate be BLUE ?

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请问大神，
这题得选什么呢？


Which of the following is not a requirement that OLS estimate be BLUE (Best Linear Unbiased Estimator)?


Choose OneThe errors must sum to zeroThe errors must be uncorrelatedThe errors must be homoscedasticThe errors must be normally distributed

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关键词：Requirement following estimate require follow following

第四个是对的，blue不依赖正态性假定

选第四个，正态分布不是BLUE的必要条件