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In book I have the following sentence: enter image description here

How can we understand "precisions" of different coeffcients(I am not native english speaker)? And why do we use quadratic function, in order to solve this problem?

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    $\begingroup$ "Precision" often is used to mean the reciprocal of the variance. $\endgroup$ – whuber Dec 30 '16 at 21:07
  • $\begingroup$ Do not worry about your English, your question is perfectly clear. $\endgroup$ – mdewey Dec 31 '16 at 13:44

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