单选
()
A <img src="https://www.beizhujiaoyu.com/uploads/202208/161223539285621.png" width="116" height="39" />  B <img src="https://www.beizhujiaoyu.com/uploads/202208/161223539837711.png" width="116" height="39" />  C <img src="https://www.beizhujiaoyu.com/uploads/202208/161223540422711.png" width="137" height="39" />  D <img src="https://www.beizhujiaoyu.com/uploads/202208/161223540829051.png" width="137" height="39" /> 
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单选
在一元线性回归的数学模型中,其正规方程组为已知,则=
A <img src="https://www.beizhujiaoyu.com/uploads/202208/161223995620531.png" width="17" height="37" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/161223996113081.png" width="19" height="40" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/161223996644171.png" width="67" height="40" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/161223997124611.png" width="67" height="40" />
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单选
随机变量Y关于X的一元线性回归方程的一般形式为()
A <img src="https://www.beizhujiaoyu.com/uploads/202208/161224155954971.png" width="96" height="20" />  B <img src="https://www.beizhujiaoyu.com/uploads/202208/16122415646941.png" width="148" height="20" />  C <img src="https://www.beizhujiaoyu.com/uploads/202208/161224157061091.png" width="89" height="36" />  D <img src="https://www.beizhujiaoyu.com/uploads/202208/161224157625421.png" width="60" height="20" /> 
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填空题:
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填空题:
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填空题:一元线性回归的数学模型为=______.
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